1156631 has 4 divisors (see below), whose sum is σ = 1321872. Its totient is φ = 991392.

The previous prime is 1156627. The next prime is 1156633. The reversal of 1156631 is 1366511.

It is a happy number.

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 1156631 - 2² = 1156627 is a prime.

It is a super-2 number, since 2×1156631² = 2675590540322, 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 = 1156597 and 1156606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156633) 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, 82610 + ... + 82623.

It is an arithmetic number, because the mean of its divisors is an integer number (330468).

2^1156631 is an apocalyptic number.

1156631 is a deficient number, since it is larger than the sum of its proper divisors (165241).

1156631 is an equidigital number, since it uses as much as digits as its factorization.

1156631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165240.

The product of its digits is 540, while the sum is 23.

The square root of 1156631 is about 1075.4678051899. The cubic root of 1156631 is about 104.9699384842.

The spelling of 1156631 in words is "one million, one hundred fifty-six thousand, six hundred thirty-one".