31698661 has 2 divisors, whose sum is σ = 31698662. Its totient is φ = 31698660.

The previous prime is 31698521. The next prime is 31698673. The reversal of 31698661 is 16689613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29430625 + 2268036 = 5425^2 + 1506^2 .

It is a cyclic number.

It is not a de Polignac number, because 31698661 - 2¹⁹ = 31174373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31698361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15849330 + 15849331.

It is an arithmetic number, because the mean of its divisors is an integer number (15849331).

Almost surely, 2^31698661 is an apocalyptic number.

It is an amenable number.

31698661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31698661 is an equidigital number, since it uses as much as digits as its factorization.

31698661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 31698661 is about 5630.1563921440. The cubic root of 31698661 is about 316.4805119495.

The spelling of 31698661 in words is "thirty-one million, six hundred ninety-eight thousand, six hundred sixty-one".