561360551 has 2 divisors, whose sum is σ = 561360552. Its totient is φ = 561360550.

The previous prime is 561360539. The next prime is 561360589. The reversal of 561360551 is 155063165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561360551 - 2⁶ = 561360487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561360521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280680275 + 280680276.

It is an arithmetic number, because the mean of its divisors is an integer number (280680276).

Almost surely, 2^561360551 is an apocalyptic number.

561360551 is a deficient number, since it is larger than the sum of its proper divisors (1).

561360551 is an equidigital number, since it uses as much as digits as its factorization.

561360551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 561360551 is about 23693.0485796995. The cubic root of 561360551 is about 824.9240461449.

The spelling of 561360551 in words is "five hundred sixty-one million, three hundred sixty thousand, five hundred fifty-one".