11531011505 has 16 divisors (see below), whose sum is σ = 14914658304. Its totient is φ = 8507755200.

The previous prime is 11531011477. The next prime is 11531011519. The reversal of 11531011505 is 50511013511.

It is not a de Polignac number, because 11531011505 - 2⁸ = 11531011249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2249 + ... + 151878.

It is an arithmetic number, because the mean of its divisors is an integer number (932166144).

Almost surely, 2^11531011505 is an apocalyptic number.

It is an amenable number.

11531011505 is a deficient number, since it is larger than the sum of its proper divisors (3383646799).

11531011505 is a wasteful number, since it uses less digits than its factorization.

11531011505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155296.

The product of its (nonzero) digits is 375, while the sum is 23.

The spelling of 11531011505 in words is "eleven billion, five hundred thirty-one million, eleven thousand, five hundred five".