1913665625 has 12 divisors (see below), whose sum is σ = 2391932844. Its totient is φ = 1530930000.

The previous prime is 1913665613. The next prime is 1913665631. The reversal of 1913665625 is 5265663191.

It can be written as a sum of positive squares in 6 ways, for example, as 1897125136 + 16540489 = 43556^2 + 4067^2 .

It is not a de Polignac number, because 1913665625 - 2⁴ = 1913665609 is a prime.

It is a super-2 number, since 2×1913665625² = 7324232248613281250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 303062 + ... + 309311.

It is an arithmetic number, because the mean of its divisors is an integer number (199327737).

Almost surely, 2^1913665625 is an apocalyptic number.

It is an amenable number.

1913665625 is a deficient number, since it is larger than the sum of its proper divisors (478267219).

1913665625 is an frugal number, since it uses more digits than its factorization.

1913665625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612398 (or 612378 counting only the distinct ones).

The product of its digits is 291600, while the sum is 44.

The square root of 1913665625 is about 43745.4640505733. The cubic root of 1913665625 is about 1241.5246648312.

The spelling of 1913665625 in words is "one billion, nine hundred thirteen million, six hundred sixty-five thousand, six hundred twenty-five".