1921501345 has 4 divisors (see below), whose sum is σ = 2305801620. Its totient is φ = 1537201072.

The previous prime is 1921501339. The next prime is 1921501349. The reversal of 1921501345 is 5431051291.

1921501345 is digitally balanced in base 6, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 218123361 + 1703377984 = 14769^2 + 41272^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921501345 - 2¹¹ = 1921499297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1921501349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192150130 + ... + 192150139.

It is an arithmetic number, because the mean of its divisors is an integer number (576450405).

Almost surely, 2^1921501345 is an apocalyptic number.

It is an amenable number.

1921501345 is a deficient number, since it is larger than the sum of its proper divisors (384300275).

1921501345 is an equidigital number, since it uses as much as digits as its factorization.

1921501345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384300274.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1921501345 is about 43834.9329302555. The cubic root of 1921501345 is about 1243.2168782548.

The spelling of 1921501345 in words is "one billion, nine hundred twenty-one million, five hundred one thousand, three hundred forty-five".