11531631 has 8 divisors (see below), whose sum is σ = 15410304. Its totient is φ = 7670360.

The previous prime is 11531621. The next prime is 11531669. The reversal of 11531631 is 13613511.

11531631 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11531631 - 2⁶ = 11531567 is a prime.

It is a super-2 number, since 2×11531631² = 265957027040322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11531598 and 11531607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2715 + ... + 5516.

It is an arithmetic number, because the mean of its divisors is an integer number (1926288).

Almost surely, 2^11531631 is an apocalyptic number.

11531631 is a deficient number, since it is larger than the sum of its proper divisors (3878673).

11531631 is an equidigital number, since it uses as much as digits as its factorization.

11531631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8701.

The product of its digits is 270, while the sum is 21.

The square root of 11531631 is about 3395.8255255534. The cubic root of 11531631 is about 225.9246296298.

The spelling of 11531631 in words is "eleven million, five hundred thirty-one thousand, six hundred thirty-one".