2945991199321 has 3 divisors (see below), whose sum is σ = 2945992915711. Its totient is φ = 2945989482932.

The previous prime is 2945991199313. The next prime is 2945991199339. The reversal of 2945991199321 is 1239911995492.

The square root of 2945991199321 is 1716389.

It is a perfect power (a square), and thus also a powerful number.

2945991199321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2944007387721 + 1983811600 = 1715811^2 + 44540^2 .

It is not a de Polignac number, because 2945991199321 - 2³ = 2945991199313 is a prime.

It is a super-2 number, since 2×2945991199321² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2945991199351) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 858195 + ... + 2574583.

Almost surely, 2^{2945991199321} is an apocalyptic number.

2945991199321 is the 1716389-th square number.

2945991199321 is the 858195-th centered octagonal number.

It is an amenable number.

2945991199321 is a deficient number, since it is larger than the sum of its proper divisors (1716390).

2945991199321 is an frugal number, since it uses more digits than its factorization.

2945991199321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432778 (or 1716389 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 64.

Multiplying 2945991199321 by its sum of digits (64), we get a square (188543436756544 = 13731112²).

The spelling of 2945991199321 in words is "two trillion, nine hundred forty-five billion, nine hundred ninety-one million, one hundred ninety-nine thousand, three hundred twenty-one".