16971949 has 2 divisors, whose sum is σ = 16971950. Its totient is φ = 16971948.

The previous prime is 16971919. The next prime is 16971961. The reversal of 16971949 is 94917961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12830724 + 4141225 = 3582^2 + 2035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16971949 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16971899 and 16971908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16971919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8485974 + 8485975.

It is an arithmetic number, because the mean of its divisors is an integer number (8485975).

Almost surely, 2^16971949 is an apocalyptic number.

It is an amenable number.

16971949 is a deficient number, since it is larger than the sum of its proper divisors (1).

16971949 is an equidigital number, since it uses as much as digits as its factorization.

16971949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 16971949 is about 4119.7025378054. The cubic root of 16971949 is about 256.9866556784.

The spelling of 16971949 in words is "sixteen million, nine hundred seventy-one thousand, nine hundred forty-nine".