561077791 has 2 divisors, whose sum is σ = 561077792. Its totient is φ = 561077790.

The previous prime is 561077789. The next prime is 561077807. The reversal of 561077791 is 197770165.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561077791 - 2¹ = 561077789 is a prime.

Together with 561077789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561077701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280538895 + 280538896.

It is an arithmetic number, because the mean of its divisors is an integer number (280538896).

Almost surely, 2^561077791 is an apocalyptic number.

561077791 is a deficient number, since it is larger than the sum of its proper divisors (1).

561077791 is an equidigital number, since it uses as much as digits as its factorization.

561077791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92610, while the sum is 43.

The square root of 561077791 is about 23687.0806770273. The cubic root of 561077791 is about 824.7855168178.

The spelling of 561077791 in words is "five hundred sixty-one million, seventy-seven thousand, seven hundred ninety-one".