31151213523 has 10 divisors (see below), whose sum is σ = 46534528964. Its totient is φ = 20767475628.

The previous prime is 31151213473. The next prime is 31151213551. The reversal of 31151213523 is 32531215113.

31151213523 is a `hidden beast` number, since 3 + 1 + 15 + 121 + 3 + 523 = 666.

It is not a de Polignac number, because 31151213523 - 2⁶ = 31151213459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31151213563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 192291361 + ... + 192291522.

Almost surely, 2^31151213523 is an apocalyptic number.

31151213523 is a deficient number, since it is larger than the sum of its proper divisors (15383315441).

31151213523 is an equidigital number, since it uses as much as digits as its factorization.

31151213523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384582895 (or 384582886 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

Adding to 31151213523 its reverse (32531215113), we get a palindrome (63682428636).

The spelling of 31151213523 in words is "thirty-one billion, one hundred fifty-one million, two hundred thirteen thousand, five hundred twenty-three".