11551645531 has 2 divisors, whose sum is σ = 11551645532. Its totient is φ = 11551645530.

The previous prime is 11551645493. The next prime is 11551645541. The reversal of 11551645531 is 13554615511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11551645531 - 2¹⁵ = 11551612763 is a prime.

It is a super-2 number, since 2×11551645531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11551645541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775822765 + 5775822766.

It is an arithmetic number, because the mean of its divisors is an integer number (5775822766).

Almost surely, 2^11551645531 is an apocalyptic number.

11551645531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11551645531 is an equidigital number, since it uses as much as digits as its factorization.

11551645531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45000, while the sum is 37.

The spelling of 11551645531 in words is "eleven billion, five hundred fifty-one million, six hundred forty-five thousand, five hundred thirty-one".