561760387 has 2 divisors, whose sum is σ = 561760388. Its totient is φ = 561760386.

The previous prime is 561760319. The next prime is 561760391. The reversal of 561760387 is 783067165.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561760387 is a prime.

It is not a weakly prime, because it can be changed into another prime (561760187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280880193 + 280880194.

It is an arithmetic number, because the mean of its divisors is an integer number (280880194).

Almost surely, 2^561760387 is an apocalyptic number.

561760387 is a deficient number, since it is larger than the sum of its proper divisors (1).

561760387 is an equidigital number, since it uses as much as digits as its factorization.

561760387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 561760387 is about 23701.4849112877. The cubic root of 561760387 is about 825.1198537839.

The spelling of 561760387 in words is "five hundred sixty-one million, seven hundred sixty thousand, three hundred eighty-seven".