1139631 has 4 divisors (see below), whose sum is σ = 1519512. Its totient is φ = 759752.

The previous prime is 1139623. The next prime is 1139669. The reversal of 1139631 is 1369311.

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 1139631 - 2³ = 1139623 is a prime.

It is a super-2 number, since 2×1139631² = 2597517632322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139681) 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, 189936 + ... + 189941.

It is an arithmetic number, because the mean of its divisors is an integer number (379878).

2^1139631 is an apocalyptic number.

1139631 is a deficient number, since it is larger than the sum of its proper divisors (379881).

1139631 is an equidigital number, since it uses as much as digits as its factorization.

1139631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379880.

The product of its digits is 486, while the sum is 24.

The square root of 1139631 is about 1067.5350111355. The cubic root of 1139631 is about 104.4531203078.

It can be divided in two parts, 1139 and 631, that added together give a triangular number (1770 = T₅₉).

The spelling of 1139631 in words is "one million, one hundred thirty-nine thousand, six hundred thirty-one".