31340731 has 2 divisors, whose sum is σ = 31340732. Its totient is φ = 31340730.

The previous prime is 31340713. The next prime is 31340753. The reversal of 31340731 is 13704313.

It is a happy number.

Together with previous prime (31340713) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (31340753) can be obtained adding 31340731 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31340731 - 2¹⁵ = 31307963 is a prime.

It is a super-2 number, since 2×31340731² = 1964482839228722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31340761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15670365 + 15670366.

It is an arithmetic number, because the mean of its divisors is an integer number (15670366).

Almost surely, 2^31340731 is an apocalyptic number.

31340731 is a deficient number, since it is larger than the sum of its proper divisors (1).

31340731 is an equidigital number, since it uses as much as digits as its factorization.

31340731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 31340731 is about 5598.2792892102. The cubic root of 31340731 is about 315.2848049862.

The spelling of 31340731 in words is "thirty-one million, three hundred forty thousand, seven hundred thirty-one".