561001057 has 2 divisors, whose sum is σ = 561001058. Its totient is φ = 561001056.

The previous prime is 561001039. The next prime is 561001109. The reversal of 561001057 is 750100165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 470065761 + 90935296 = 21681^2 + 9536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561001057 is a prime.

It is not a weakly prime, because it can be changed into another prime (561001157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280500528 + 280500529.

It is an arithmetic number, because the mean of its divisors is an integer number (280500529).

Almost surely, 2^561001057 is an apocalyptic number.

It is an amenable number.

561001057 is a deficient number, since it is larger than the sum of its proper divisors (1).

561001057 is an equidigital number, since it uses as much as digits as its factorization.

561001057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 561001057 is about 23685.4608779310. The cubic root of 561001057 is about 824.7479153905.

The spelling of 561001057 in words is "five hundred sixty-one million, one thousand, fifty-seven".