551555791 has 2 divisors, whose sum is σ = 551555792. Its totient is φ = 551555790.

The previous prime is 551555779. The next prime is 551555831. The reversal of 551555791 is 197555155.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551555791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551555891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275777895 + 275777896.

It is an arithmetic number, because the mean of its divisors is an integer number (275777896).

Almost surely, 2^551555791 is an apocalyptic number.

551555791 is a deficient number, since it is larger than the sum of its proper divisors (1).

551555791 is an equidigital number, since it uses as much as digits as its factorization.

551555791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196875, while the sum is 43.

The square root of 551555791 is about 23485.2249510197. The cubic root of 551555791 is about 820.0930843169.

The spelling of 551555791 in words is "five hundred fifty-one million, five hundred fifty-five thousand, seven hundred ninety-one".