11518990531 has 2 divisors, whose sum is σ = 11518990532. Its totient is φ = 11518990530.

The previous prime is 11518990529. The next prime is 11518990583. The reversal of 11518990531 is 13509981511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11518990531 - 2¹ = 11518990529 is a prime.

It is a super-2 number, since 2×11518990531² (a number of 21 digits) contains 22 as substring.

Together with 11518990529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11518991531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5759495265 + 5759495266.

It is an arithmetic number, because the mean of its divisors is an integer number (5759495266).

Almost surely, 2^11518990531 is an apocalyptic number.

11518990531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11518990531 is an equidigital number, since it uses as much as digits as its factorization.

11518990531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 43.

The spelling of 11518990531 in words is "eleven billion, five hundred eighteen million, nine hundred ninety thousand, five hundred thirty-one".