1231525516 has 12 divisors (see below), whose sum is σ = 2320952032. Its totient is φ = 568396368.

The previous prime is 1231525511. The next prime is 1231525517. The reversal of 1231525516 is 6155251321.

It is not an unprimeable number, because it can be changed into a prime (1231525511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11841540 + ... + 11841643.

Almost surely, 2^1231525516 is an apocalyptic number.

It is an amenable number.

1231525516 is a deficient number, since it is larger than the sum of its proper divisors (1089426516).

1231525516 is a wasteful number, since it uses less digits than its factorization.

1231525516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23683200 (or 23683198 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 1231525516 is about 35093.0978398887. The cubic root of 1231525516 is about 1071.8840408375.

Adding to 1231525516 its reverse (6155251321), we get a palindrome (7386776837).

The spelling of 1231525516 in words is "one billion, two hundred thirty-one million, five hundred twenty-five thousand, five hundred sixteen".