16971961 has 2 divisors, whose sum is σ = 16971962. Its totient is φ = 16971960.

The previous prime is 16971949. The next prime is 16971979. The reversal of 16971961 is 16917961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15848361 + 1123600 = 3981^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 16971961 - 2¹¹ = 16969913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16972961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8485980 + 8485981.

It is an arithmetic number, because the mean of its divisors is an integer number (8485981).

Almost surely, 2^16971961 is an apocalyptic number.

It is an amenable number.

16971961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16971961 is an equidigital number, since it uses as much as digits as its factorization.

16971961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 40.

The square root of 16971961 is about 4119.7039942209. The cubic root of 16971961 is about 256.9867162458.

The spelling of 16971961 in words is "sixteen million, nine hundred seventy-one thousand, nine hundred sixty-one".