1561014457 has 2 divisors, whose sum is σ = 1561014458. Its totient is φ = 1561014456.

The previous prime is 1561014401. The next prime is 1561014463. The reversal of 1561014457 is 7544101651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 839608576 + 721405881 = 28976^2 + 26859^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561014457 - 2²³ = 1552625849 is a prime.

It is a super-2 number, since 2×1561014457² = 4873532269926009698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1561014467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780507228 + 780507229.

It is an arithmetic number, because the mean of its divisors is an integer number (780507229).

Almost surely, 2^1561014457 is an apocalyptic number.

It is an amenable number.

1561014457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561014457 is an equidigital number, since it uses as much as digits as its factorization.

1561014457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 1561014457 is about 39509.6754858857. The cubic root of 1561014457 is about 1160.0293435403.

The spelling of 1561014457 in words is "one billion, five hundred sixty-one million, fourteen thousand, four hundred fifty-seven".