551290891 has 2 divisors, whose sum is σ = 551290892. Its totient is φ = 551290890.

The previous prime is 551290849. The next prime is 551290903. The reversal of 551290891 is 198092155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551290891 - 2¹⁹ = 550766603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (551290801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275645445 + 275645446.

It is an arithmetic number, because the mean of its divisors is an integer number (275645446).

Almost surely, 2^551290891 is an apocalyptic number.

551290891 is a deficient number, since it is larger than the sum of its proper divisors (1).

551290891 is an equidigital number, since it uses as much as digits as its factorization.

551290891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 551290891 is about 23479.5845576535. The cubic root of 551290891 is about 819.9617724594.

The spelling of 551290891 in words is "five hundred fifty-one million, two hundred ninety thousand, eight hundred ninety-one".