31701661 has 2 divisors, whose sum is σ = 31701662. Its totient is φ = 31701660.

The previous prime is 31701629. The next prime is 31701667. The reversal of 31701661 is 16610713.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31696900 + 4761 = 5630^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 31701661 - 2⁵ = 31701629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31701667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15850830 + 15850831.

It is an arithmetic number, because the mean of its divisors is an integer number (15850831).

Almost surely, 2^31701661 is an apocalyptic number.

It is an amenable number.

31701661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31701661 is an equidigital number, since it uses as much as digits as its factorization.

31701661 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 25.

The square root of 31701661 is about 5630.4228082800. The cubic root of 31701661 is about 316.4904956686.

The spelling of 31701661 in words is "thirty-one million, seven hundred one thousand, six hundred sixty-one".