11621731 has 4 divisors (see below), whose sum is σ = 12678264. Its totient is φ = 10565200.

The previous prime is 11621723. The next prime is 11621773. The reversal of 11621731 is 13712611.

11621731 is digitally balanced in base 2, because in such base 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 an emirpimes, since its reverse is a distinct semiprime: 13712611 = 11 ⋅1246601.

It is a cyclic number.

It is not a de Polignac number, because 11621731 - 2³ = 11621723 is a prime.

It is a super-2 number, since 2×11621731² = 270129262872722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11621791) 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, 528250 + ... + 528271.

It is an arithmetic number, because the mean of its divisors is an integer number (3169566).

Almost surely, 2^11621731 is an apocalyptic number.

11621731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11621731 is a deficient number, since it is larger than the sum of its proper divisors (1056533).

11621731 is a wasteful number, since it uses less digits than its factorization.

11621731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056532.

The product of its digits is 252, while the sum is 22.

The square root of 11621731 is about 3409.0660011211. The cubic root of 11621731 is about 226.5115088194.

The spelling of 11621731 in words is "eleven million, six hundred twenty-one thousand, seven hundred thirty-one".