11615542531 has 2 divisors, whose sum is σ = 11615542532. Its totient is φ = 11615542530.

The previous prime is 11615542529. The next prime is 11615542537. The reversal of 11615542531 is 13524551611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11615542531 - 2¹ = 11615542529 is a prime.

It is a super-2 number, since 2×11615542531² (a number of 21 digits) contains 22 as substring.

Together with 11615542529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11615542537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5807771265 + 5807771266.

It is an arithmetic number, because the mean of its divisors is an integer number (5807771266).

Almost surely, 2^11615542531 is an apocalyptic number.

11615542531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11615542531 is an equidigital number, since it uses as much as digits as its factorization.

11615542531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 34.

The spelling of 11615542531 in words is "eleven billion, six hundred fifteen million, five hundred forty-two thousand, five hundred thirty-one".