9131891697604 has 81 divisors (see below), whose sum is σ = 17562553542471. Its totient is φ = 4152818604480.

The previous prime is 9131891697581. The next prime is 9131891697631. The reversal of 9131891697604 is 4067961981319.

The square root of 9131891697604 is 3021902.

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

It can be written as a sum of positive squares in 4 ways, for example, as 6474470072004 + 2657421625600 = 2544498^2 + 1630160^2 .

It is a super-3 number, since 3×9131891697604³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5578430274 + ... + 5578431910.

Almost surely, 2^{9131891697604} is an apocalyptic number.

9131891697604 is the 3021902-nd square number.

It is an amenable number.

9131891697604 is a deficient number, since it is larger than the sum of its proper divisors (8430661844867).

9131891697604 is an equidigital number, since it uses as much as digits as its factorization.

9131891697604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3446 (or 1723 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 64.

Multiplying 9131891697604 by its sum of digits (64), we get a square (584441068646656 = 24175216²).

The spelling of 9131891697604 in words is "nine trillion, one hundred thirty-one billion, eight hundred ninety-one million, six hundred ninety-seven thousand, six hundred four".