561256277 has 2 divisors, whose sum is σ = 561256278. Its totient is φ = 561256276.

The previous prime is 561256261. The next prime is 561256291. The reversal of 561256277 is 772652165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293573956 + 267682321 = 17134^2 + 16361^2 .

It is a cyclic number.

It is not a de Polignac number, because 561256277 - 2⁴ = 561256261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561256247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280628138 + 280628139.

It is an arithmetic number, because the mean of its divisors is an integer number (280628139).

Almost surely, 2^561256277 is an apocalyptic number.

It is an amenable number.

561256277 is a deficient number, since it is larger than the sum of its proper divisors (1).

561256277 is an equidigital number, since it uses as much as digits as its factorization.

561256277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 41.

The square root of 561256277 is about 23690.8479586527. The cubic root of 561256277 is about 824.8729658090.

The spelling of 561256277 in words is "five hundred sixty-one million, two hundred fifty-six thousand, two hundred seventy-seven".