11913261531 has 4 divisors (see below), whose sum is σ = 15884348712. Its totient is φ = 7942174352.

The previous prime is 11913261511. The next prime is 11913261553. The reversal of 11913261531 is 13516231911.

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

It is a cyclic number.

It is not a de Polignac number, because 11913261531 - 2⁷ = 11913261403 is a prime.

It is a super-2 number, since 2×11913261531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11913261492 and 11913261501.

It is not an unprimeable number, because it can be changed into a prime (11913261511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985543586 + ... + 1985543591.

It is an arithmetic number, because the mean of its divisors is an integer number (3971087178).

Almost surely, 2^11913261531 is an apocalyptic number.

11913261531 is a deficient number, since it is larger than the sum of its proper divisors (3971087181).

11913261531 is an equidigital number, since it uses as much as digits as its factorization.

11913261531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971087180.

The product of its digits is 4860, while the sum is 33.

The spelling of 11913261531 in words is "eleven billion, nine hundred thirteen million, two hundred sixty-one thousand, five hundred thirty-one".