12123551431 has 16 divisors (see below), whose sum is σ = 12491496000. Its totient is φ = 11762454528.

The previous prime is 12123551423. The next prime is 12123551437. The reversal of 12123551431 is 13415532121.

It is a cyclic number.

It is not a de Polignac number, because 12123551431 - 2³ = 12123551423 is a prime.

It is a super-2 number, since 2×12123551431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12123551431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123551437) 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, 1288215 + ... + 1297591.

It is an arithmetic number, because the mean of its divisors is an integer number (780718500).

Almost surely, 2^12123551431 is an apocalyptic number.

12123551431 is a deficient number, since it is larger than the sum of its proper divisors (367944569).

12123551431 is an equidigital number, since it uses as much as digits as its factorization.

12123551431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9738.

The product of its digits is 3600, while the sum is 28.

The spelling of 12123551431 in words is "twelve billion, one hundred twenty-three million, five hundred fifty-one thousand, four hundred thirty-one".