1313731 has 2 divisors, whose sum is σ = 1313732. Its totient is φ = 1313730.

The previous prime is 1313723. The next prime is 1313747. The reversal of 1313731 is 1373131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1313731 - 2³ = 1313723 is a prime.

It is a super-2 number, since 2×1313731² = 3451778280722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1313699 and 1313708.

It is not a weakly prime, because it can be changed into another prime (1313701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656865 + 656866.

It is an arithmetic number, because the mean of its divisors is an integer number (656866).

2^1313731 is an apocalyptic number.

1313731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313731 is an equidigital number, since it uses as much as digits as its factorization.

1313731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189, while the sum is 19.

The square root of 1313731 is about 1146.1810502709. The cubic root of 1313731 is about 109.5221975668.

Adding to 1313731 its reverse (1373131), we get a palindrome (2686862).

It can be divided in two parts, 13 and 13731, that multiplied together give a triangular number (178503 = T₅₉₇).

The spelling of 1313731 in words is "one million, three hundred thirteen thousand, seven hundred thirty-one".