11531011506 has 16 divisors (see below), whose sum is σ = 26356597824. Its totient is φ = 3294574704.

The previous prime is 11531011477. The next prime is 11531011519. The reversal of 11531011506 is 60511013511.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137273905 + ... + 137273988.

It is an arithmetic number, because the mean of its divisors is an integer number (1647287364).

Almost surely, 2^11531011506 is an apocalyptic number.

11531011506 is an abundant number, since it is smaller than the sum of its proper divisors (14825586318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11531011506 is a wasteful number, since it uses less digits than its factorization.

11531011506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274547905.

The product of its (nonzero) digits is 450, while the sum is 24.

The spelling of 11531011506 in words is "eleven billion, five hundred thirty-one million, eleven thousand, five hundred six".