561615149 has 2 divisors, whose sum is σ = 561615150. Its totient is φ = 561615148.

The previous prime is 561615137. The next prime is 561615163. The reversal of 561615149 is 941516165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549574249 + 12040900 = 23443^2 + 3470^2 .

It is a cyclic number.

It is not a de Polignac number, because 561615149 - 2¹⁶ = 561549613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561615049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280807574 + 280807575.

It is an arithmetic number, because the mean of its divisors is an integer number (280807575).

Almost surely, 2^561615149 is an apocalyptic number.

It is an amenable number.

561615149 is a deficient number, since it is larger than the sum of its proper divisors (1).

561615149 is an equidigital number, since it uses as much as digits as its factorization.

561615149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The square root of 561615149 is about 23698.4208123664. The cubic root of 561615149 is about 825.0487385960.

The spelling of 561615149 in words is "five hundred sixty-one million, six hundred fifteen thousand, one hundred forty-nine".