12517812231 has 16 divisors (see below), whose sum is σ = 17006008320. Its totient is φ = 8187957440.

The previous prime is 12517812227. The next prime is 12517812233. The reversal of 12517812231 is 13221871521.

It is a cyclic number.

It is not a de Polignac number, because 12517812231 - 2² = 12517812227 is a prime.

It is a super-2 number, since 2×12517812231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12517812192 and 12517812201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12517812233) 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, 24346 + ... + 160088.

It is an arithmetic number, because the mean of its divisors is an integer number (1062875520).

Almost surely, 2^12517812231 is an apocalyptic number.

12517812231 is a deficient number, since it is larger than the sum of its proper divisors (4488196089).

12517812231 is a wasteful number, since it uses less digits than its factorization.

12517812231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136326.

The product of its digits is 6720, while the sum is 33.

The spelling of 12517812231 in words is "twelve billion, five hundred seventeen million, eight hundred twelve thousand, two hundred thirty-one".