11611531 has 4 divisors (see below), whose sum is σ = 11619472. Its totient is φ = 11603592.

The previous prime is 11611529. The next prime is 11611543. The reversal of 11611531 is 13511611.

11611531 is nontrivially palindromic in base 14.

11611531 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11611531 - 2¹ = 11611529 is a prime.

It is a super-2 number, since 2×11611531² = 269655304327922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11611499 and 11611508.

It is not an unprimeable number, because it can be changed into a prime (11611931) 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, 1071 + ... + 4936.

It is an arithmetic number, because the mean of its divisors is an integer number (2904868).

Almost surely, 2^11611531 is an apocalyptic number.

11611531 is a deficient number, since it is larger than the sum of its proper divisors (7941).

11611531 is an equidigital number, since it uses as much as digits as its factorization.

11611531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7940.

The product of its digits is 90, while the sum is 19.

The square root of 11611531 is about 3407.5696617971. The cubic root of 11611531 is about 226.4452222612.

The spelling of 11611531 in words is "eleven million, six hundred eleven thousand, five hundred thirty-one".