11555006531 has 2 divisors, whose sum is σ = 11555006532. Its totient is φ = 11555006530.

The previous prime is 11555006521. The next prime is 11555006591. The reversal of 11555006531 is 13560055511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11555006531 - 2⁶ = 11555006467 is a prime.

It is a super-2 number, since 2×11555006531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11555006521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777503265 + 5777503266.

It is an arithmetic number, because the mean of its divisors is an integer number (5777503266).

Almost surely, 2^11555006531 is an apocalyptic number.

11555006531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11555006531 is an equidigital number, since it uses as much as digits as its factorization.

11555006531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 32.

The spelling of 11555006531 in words is "eleven billion, five hundred fifty-five million, six thousand, five hundred thirty-one".