931497149881 has 9 divisors (see below), whose sum is σ = 989531703021. Its totient is φ = 876687757632.

The previous prime is 931497149873. The next prime is 931497149911. The reversal of 931497149881 is 188941794139.

It is a happy number.

The square root of 931497149881 is 965141.

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

931497149881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1854077481 + 929643072400 = 43059^2 + 964180^2 .

It is not a de Polignac number, because 931497149881 - 2³ = 931497149873 is a prime.

It is a super-2 number, since 2×931497149881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (931497149851) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16379011 + ... + 16435783.

Almost surely, 2^931497149881 is an apocalyptic number.

931497149881 is the 965141-st square number.

931497149881 is the 482571-st centered octagonal number.

It is an amenable number.

931497149881 is a deficient number, since it is larger than the sum of its proper divisors (58034553140).

931497149881 is an frugal number, since it uses more digits than its factorization.

931497149881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113580 (or 56790 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 64.

Multiplying 931497149881 by its sum of digits (64), we get a square (59615817592384 = 7721128²).

The spelling of 931497149881 in words is "nine hundred thirty-one billion, four hundred ninety-seven million, one hundred forty-nine thousand, eight hundred eighty-one".