12135251531 has 16 divisors (see below), whose sum is σ = 13760910240. Its totient is φ = 10608848640.

The previous prime is 12135251507. The next prime is 12135251539. The reversal of 12135251531 is 13515253121.

It is not a de Polignac number, because 12135251531 - 2¹⁰ = 12135250507 is a prime.

It is a super-2 number, since 2×12135251531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12135251494 and 12135251503.

It is not an unprimeable number, because it can be changed into a prime (12135251539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086431 + ... + 1097543.

It is an arithmetic number, because the mean of its divisors is an integer number (860056890).

Almost surely, 2^12135251531 is an apocalyptic number.

12135251531 is a deficient number, since it is larger than the sum of its proper divisors (1625658709).

12135251531 is a wasteful number, since it uses less digits than its factorization.

12135251531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15566.

The product of its digits is 4500, while the sum is 29.

The spelling of 12135251531 in words is "twelve billion, one hundred thirty-five million, two hundred fifty-one thousand, five hundred thirty-one".