1312531 has 4 divisors (see below), whose sum is σ = 1431864. Its totient is φ = 1193200.

The previous prime is 1312523. The next prime is 1312543. The reversal of 1312531 is 1352131.

1312531 = T₄₈₃ + T₄₈₄ + ... + T₄₉₃.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1352131 = 11 ⋅122921.

It is a cyclic number.

It is not a de Polignac number, because 1312531 - 2³ = 1312523 is a prime.

It is a super-2 number, since 2×1312531² = 3445475251922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312561) 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, 59650 + ... + 59671.

It is an arithmetic number, because the mean of its divisors is an integer number (357966).

2^1312531 is an apocalyptic number.

1312531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1312531 is a deficient number, since it is larger than the sum of its proper divisors (119333).

1312531 is a wasteful number, since it uses less digits than its factorization.

1312531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119332.

The product of its digits is 90, while the sum is 16.

The square root of 1312531 is about 1145.6574531683. The cubic root of 1312531 is about 109.4888404910.

Adding to 1312531 its reverse (1352131), we get a palindrome (2664662).

It can be divided in two parts, 131 and 2531, that added together give a palindrome (2662).

The spelling of 1312531 in words is "one million, three hundred twelve thousand, five hundred thirty-one".