131231516 has 48 divisors (see below), whose sum is σ = 253413888. Its totient is φ = 59097600.

The previous prime is 131231431. The next prime is 131231521. The reversal of 131231516 is 615132131.

It is a junction number, because it is equal to n+sod(n) for n = 131231491 and 131231500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 686981 + ... + 687171.

It is an arithmetic number, because the mean of its divisors is an integer number (5279456).

Almost surely, 2^131231516 is an apocalyptic number.

It is an amenable number.

131231516 is a deficient number, since it is larger than the sum of its proper divisors (122182372).

131231516 is a wasteful number, since it uses less digits than its factorization.

131231516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 460 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 131231516 is about 11455.6325010887. The cubic root of 131231516 is about 508.1743206903.

Adding to 131231516 its reverse (615132131), we get a palindrome (746363647).

The spelling of 131231516 in words is "one hundred thirty-one million, two hundred thirty-one thousand, five hundred sixteen".