12155045531 has 2 divisors, whose sum is σ = 12155045532. Its totient is φ = 12155045530.

The previous prime is 12155045527. The next prime is 12155045537. The reversal of 12155045531 is 13554055121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12155045531 - 2² = 12155045527 is a prime.

It is a super-2 number, since 2×12155045531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12155045537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077522765 + 6077522766.

It is an arithmetic number, because the mean of its divisors is an integer number (6077522766).

Almost surely, 2^12155045531 is an apocalyptic number.

12155045531 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155045531 is an equidigital number, since it uses as much as digits as its factorization.

12155045531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 12155045531 in words is "twelve billion, one hundred fifty-five million, forty-five thousand, five hundred thirty-one".