16877921 has 2 divisors, whose sum is σ = 16877922. Its totient is φ = 16877920.

The previous prime is 16877897. The next prime is 16877933. The reversal of 16877921 is 12977861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 26896 = 4105^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 16877921 - 2¹⁰ = 16876897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16877951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8438960 + 8438961.

It is an arithmetic number, because the mean of its divisors is an integer number (8438961).

Almost surely, 2^16877921 is an apocalyptic number.

It is an amenable number.

16877921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16877921 is an equidigital number, since it uses as much as digits as its factorization.

16877921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 16877921 is about 4108.2746987026. The cubic root of 16877921 is about 256.5111906728.

The spelling of 16877921 in words is "sixteen million, eight hundred seventy-seven thousand, nine hundred twenty-one".