1391152831 has 4 divisors (see below), whose sum is σ = 1403464032. Its totient is φ = 1378841632.

The previous prime is 1391152801. The next prime is 1391152843. The reversal of 1391152831 is 1382511931.

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 1391152831 - 2⁷ = 1391152703 is a prime.

It is a super-2 number, since 2×1391152831² = 3870612398398629122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391152801) 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, 6155431 + ... + 6155656.

It is an arithmetic number, because the mean of its divisors is an integer number (350866008).

Almost surely, 2^1391152831 is an apocalyptic number.

1391152831 is a deficient number, since it is larger than the sum of its proper divisors (12311201).

1391152831 is a wasteful number, since it uses less digits than its factorization.

1391152831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12311200.

The product of its digits is 6480, while the sum is 34.

The square root of 1391152831 is about 37298.1612281356. The cubic root of 1391152831 is about 1116.3274773579.

The spelling of 1391152831 in words is "one billion, three hundred ninety-one million, one hundred fifty-two thousand, eight hundred thirty-one".