551635897 has 2 divisors, whose sum is σ = 551635898. Its totient is φ = 551635896.

The previous prime is 551635859. The next prime is 551635913. The reversal of 551635897 is 798536155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551498256 + 137641 = 23484^2 + 371^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551635897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551635897.

It is not a weakly prime, because it can be changed into another prime (551635807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275817948 + 275817949.

It is an arithmetic number, because the mean of its divisors is an integer number (275817949).

Almost surely, 2^551635897 is an apocalyptic number.

It is an amenable number.

551635897 is a deficient number, since it is larger than the sum of its proper divisors (1).

551635897 is an equidigital number, since it uses as much as digits as its factorization.

551635897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134000, while the sum is 49.

The square root of 551635897 is about 23486.9303443426. The cubic root of 551635897 is about 820.1327848619.

The spelling of 551635897 in words is "five hundred fifty-one million, six hundred thirty-five thousand, eight hundred ninety-seven".