561995647 has 2 divisors, whose sum is σ = 561995648. Its totient is φ = 561995646.

The previous prime is 561995617. The next prime is 561995657. The reversal of 561995647 is 746599165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561995647 - 2⁷ = 561995519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561995594 and 561995603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561995617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280997823 + 280997824.

It is an arithmetic number, because the mean of its divisors is an integer number (280997824).

Almost surely, 2^561995647 is an apocalyptic number.

561995647 is a deficient number, since it is larger than the sum of its proper divisors (1).

561995647 is an equidigital number, since it uses as much as digits as its factorization.

561995647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The square root of 561995647 is about 23706.4473719704. The cubic root of 561995647 is about 825.2350218695.

The spelling of 561995647 in words is "five hundred sixty-one million, nine hundred ninety-five thousand, six hundred forty-seven".