1312431 has 8 divisors (see below), whose sum is σ = 1760304. Its totient is φ = 869760.

The previous prime is 1312411. The next prime is 1312459. The reversal of 1312431 is 1342131.

1312431 = T₁₈ + T₁₉ + ... + T₁₉₈.

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

It is not a de Polignac number, because 1312431 - 2⁷ = 1312303 is a prime.

It is a super-2 number, since 2×1312431² = 3444950259522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1312431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312411) 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, 666 + ... + 1751.

It is an arithmetic number, because the mean of its divisors is an integer number (220038).

2^1312431 is an apocalyptic number.

1312431 is a deficient number, since it is larger than the sum of its proper divisors (447873).

1312431 is a wasteful number, since it uses less digits than its factorization.

1312431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601.

The product of its digits is 72, while the sum is 15.

The square root of 1312431 is about 1145.6138092743. The cubic root of 1312431 is about 109.4860598171.

Adding to 1312431 its reverse (1342131), we get a palindrome (2654562).

The spelling of 1312431 in words is "one million, three hundred twelve thousand, four hundred thirty-one".