402554891 has 2 divisors, whose sum is σ = 402554892. Its totient is φ = 402554890.

The previous prime is 402554879. The next prime is 402554899. The reversal of 402554891 is 198455204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402554891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402554899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201277445 + 201277446.

It is an arithmetic number, because the mean of its divisors is an integer number (201277446).

Almost surely, 2^402554891 is an apocalyptic number.

402554891 is a deficient number, since it is larger than the sum of its proper divisors (1).

402554891 is an equidigital number, since it uses as much as digits as its factorization.

402554891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 402554891 is about 20063.7706077397. The cubic root of 402554891 is about 738.3716880996.

The spelling of 402554891 in words is "four hundred two million, five hundred fifty-four thousand, eight hundred ninety-one".