31740613 has 4 divisors (see below), whose sum is σ = 31794028. Its totient is φ = 31687200.

The previous prime is 31740607. The next prime is 31740617. The reversal of 31740613 is 31604713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31604713 = 7 ⋅4514959.

It can be written as a sum of positive squares in 2 ways, for example, as 9622404 + 22118209 = 3102^2 + 4703^2 .

It is a cyclic number.

It is not a de Polignac number, because 31740613 - 2¹⁷ = 31609541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31740617) 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, 25806 + ... + 27007.

It is an arithmetic number, because the mean of its divisors is an integer number (7948507).

Almost surely, 2^31740613 is an apocalyptic number.

It is an amenable number.

31740613 is a deficient number, since it is larger than the sum of its proper divisors (53415).

31740613 is an equidigital number, since it uses as much as digits as its factorization.

31740613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53414.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 31740613 is about 5633.8808116608. The cubic root of 31740613 is about 316.6200671349.

The spelling of 31740613 in words is "thirty-one million, seven hundred forty thousand, six hundred thirteen".