1315731 has 16 divisors (see below), whose sum is σ = 1895040. Its totient is φ = 809280.

The previous prime is 1315729. The next prime is 1315747. The reversal of 1315731 is 1375131.

It is not a de Polignac number, because 1315731 - 2¹ = 1315729 is a prime.

It is a super-2 number, since 2×1315731² = 3462296128722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1315698 and 1315707.

It is not an unprimeable number, because it can be changed into a prime (1315711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2056 + ... + 2618.

It is an arithmetic number, because the mean of its divisors is an integer number (118440).

2^1315731 is an apocalyptic number.

1315731 is a deficient number, since it is larger than the sum of its proper divisors (579309).

1315731 is a wasteful number, since it uses less digits than its factorization.

1315731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626.

The product of its digits is 315, while the sum is 21.

The square root of 1315731 is about 1147.0531809816. The cubic root of 1315731 is about 109.5777475824.

The spelling of 1315731 in words is "one million, three hundred fifteen thousand, seven hundred thirty-one".