404256551 has 2 divisors, whose sum is σ = 404256552. Its totient is φ = 404256550.

The previous prime is 404256547. The next prime is 404256569. The reversal of 404256551 is 155652404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404256551 - 2² = 404256547 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404256571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202128275 + 202128276.

It is an arithmetic number, because the mean of its divisors is an integer number (202128276).

Almost surely, 2^404256551 is an apocalyptic number.

404256551 is a deficient number, since it is larger than the sum of its proper divisors (1).

404256551 is an equidigital number, since it uses as much as digits as its factorization.

404256551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 404256551 is about 20106.1321740408. The cubic root of 404256551 is about 739.4106282369.

The spelling of 404256551 in words is "four hundred four million, two hundred fifty-six thousand, five hundred fifty-one".