11634261521 has 4 divisors (see below), whose sum is σ = 11663275044. Its totient is φ = 11605248000.

The previous prime is 11634261487. The next prime is 11634261523. The reversal of 11634261521 is 12516243611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11232820225 + 401441296 = 105985^2 + 20036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11634261521 is a prime.

It is a super-2 number, since 2×11634261521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11634261523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14506160 + ... + 14506961.

It is an arithmetic number, because the mean of its divisors is an integer number (2915818761).

Almost surely, 2^11634261521 is an apocalyptic number.

It is an amenable number.

11634261521 is a deficient number, since it is larger than the sum of its proper divisors (29013523).

11634261521 is an equidigital number, since it uses as much as digits as its factorization.

11634261521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29013522.

The product of its digits is 8640, while the sum is 32.

The spelling of 11634261521 in words is "eleven billion, six hundred thirty-four million, two hundred sixty-one thousand, five hundred twenty-one".