561653671 has 2 divisors, whose sum is σ = 561653672. Its totient is φ = 561653670.

The previous prime is 561653647. The next prime is 561653681. The reversal of 561653671 is 176356165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561653671 - 2⁵ = 561653639 is a prime.

It is a super-2 number, since 2×561653671² = 630909692295552482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561653611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280826835 + 280826836.

It is an arithmetic number, because the mean of its divisors is an integer number (280826836).

Almost surely, 2^561653671 is an apocalyptic number.

561653671 is a deficient number, since it is larger than the sum of its proper divisors (1).

561653671 is an equidigital number, since it uses as much as digits as its factorization.

561653671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 40.

The square root of 561653671 is about 23699.2335530076. The cubic root of 561653671 is about 825.0676019291.

The spelling of 561653671 in words is "five hundred sixty-one million, six hundred fifty-three thousand, six hundred seventy-one".