2039515921 has 3 divisors (see below), whose sum is σ = 2039561083. Its totient is φ = 2039470760.

The previous prime is 2039515909. The next prime is 2039515937. The reversal of 2039515921 is 1295159302.

The square root of 2039515921 is 45161.

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

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., 1512354321 + 527161600 = 38889^2 + 22960^2 .

It is not a de Polignac number, because 2039515921 - 2¹¹ = 2039513873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2039515991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22581 + ... + 67741.

Almost surely, 2^2039515921 is an apocalyptic number.

2039515921 is the 45161-st square number.

2039515921 is the 22581-st centered octagonal number.

It is an amenable number.

2039515921 is a deficient number, since it is larger than the sum of its proper divisors (45162).

2039515921 is an frugal number, since it uses more digits than its factorization.

2039515921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90322 (or 45161 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The cubic root of 2039515921 is about 1268.1648160625.

The spelling of 2039515921 in words is "two billion, thirty-nine million, five hundred fifteen thousand, nine hundred twenty-one".