31927661 has 2 divisors, whose sum is σ = 31927662. Its totient is φ = 31927660.

The previous prime is 31927627. The next prime is 31927663. The reversal of 31927661 is 16672913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21808900 + 10118761 = 4670^2 + 3181^2 .

It is a cyclic number.

It is not a de Polignac number, because 31927661 - 2¹⁴ = 31911277 is a prime.

Together with 31927663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31927663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15963830 + 15963831.

It is an arithmetic number, because the mean of its divisors is an integer number (15963831).

Almost surely, 2^31927661 is an apocalyptic number.

It is an amenable number.

31927661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31927661 is an equidigital number, since it uses as much as digits as its factorization.

31927661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 31927661 is about 5650.4567072052. The cubic root of 31927661 is about 317.2407986389.

The spelling of 31927661 in words is "thirty-one million, nine hundred twenty-seven thousand, six hundred sixty-one".