561239671 has 2 divisors, whose sum is σ = 561239672. Its totient is φ = 561239670.

The previous prime is 561239663. The next prime is 561239677. The reversal of 561239671 is 176932165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561239671 - 2³ = 561239663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561239677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280619835 + 280619836.

It is an arithmetic number, because the mean of its divisors is an integer number (280619836).

Almost surely, 2^561239671 is an apocalyptic number.

561239671 is a deficient number, since it is larger than the sum of its proper divisors (1).

561239671 is an equidigital number, since it uses as much as digits as its factorization.

561239671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 561239671 is about 23690.4974831682. The cubic root of 561239671 is about 824.8648305025.

The spelling of 561239671 in words is "five hundred sixty-one million, two hundred thirty-nine thousand, six hundred seventy-one".