561001157 has 2 divisors, whose sum is σ = 561001158. Its totient is φ = 561001156.

The previous prime is 561001109. The next prime is 561001159. The reversal of 561001157 is 751100165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538286401 + 22714756 = 23201^2 + 4766^2 .

It is a cyclic number.

It is not a de Polignac number, because 561001157 - 2¹⁰ = 561000133 is a prime.

Together with 561001159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561001159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280500578 + 280500579.

It is an arithmetic number, because the mean of its divisors is an integer number (280500579).

Almost surely, 2^561001157 is an apocalyptic number.

It is an amenable number.

561001157 is a deficient number, since it is larger than the sum of its proper divisors (1).

561001157 is an equidigital number, since it uses as much as digits as its factorization.

561001157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1050, while the sum is 26.

The square root of 561001157 is about 23685.4629889306. The cubic root of 561001157 is about 824.7479643951.

The spelling of 561001157 in words is "five hundred sixty-one million, one thousand, one hundred fifty-seven".