16977997 has 2 divisors, whose sum is σ = 16977998. Its totient is φ = 16977996.

The previous prime is 16977973. The next prime is 16978009. The reversal of 16977997 is 79977961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11874916 + 5103081 = 3446^2 + 2259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16977997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16977937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8488998 + 8488999.

It is an arithmetic number, because the mean of its divisors is an integer number (8488999).

Almost surely, 2^16977997 is an apocalyptic number.

It is an amenable number.

16977997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16977997 is an equidigital number, since it uses as much as digits as its factorization.

16977997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500282, while the sum is 55.

The square root of 16977997 is about 4120.4365060027. The cubic root of 16977997 is about 257.0171780168.

The spelling of 16977997 in words is "sixteen million, nine hundred seventy-seven thousand, nine hundred ninety-seven".