16919957 has 2 divisors, whose sum is σ = 16919958. Its totient is φ = 16919956.

The previous prime is 16919923. The next prime is 16919971. The reversal of 16919957 is 75991961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12630916 + 4289041 = 3554^2 + 2071^2 .

It is a cyclic number.

It is not a de Polignac number, because 16919957 - 2¹⁰ = 16918933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16919977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8459978 + 8459979.

It is an arithmetic number, because the mean of its divisors is an integer number (8459979).

Almost surely, 2^16919957 is an apocalyptic number.

It is an amenable number.

16919957 is a deficient number, since it is larger than the sum of its proper divisors (1).

16919957 is an equidigital number, since it uses as much as digits as its factorization.

16919957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153090, while the sum is 47.

The square root of 16919957 is about 4113.3875334084. The cubic root of 16919957 is about 256.7239689530.

It can be divided in two parts, 169 and 19957, that multiplied together give a palindrome (3372733).

The spelling of 16919957 in words is "sixteen million, nine hundred nineteen thousand, nine hundred fifty-seven".