561979257 has 16 divisors (see below), whose sum is σ = 864209280. Its totient is φ = 318183552.

The previous prime is 561979241. The next prime is 561979259. The reversal of 561979257 is 752979165.

It is not a de Polignac number, because 561979257 - 2⁴ = 561979241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561979259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120468 + ... + 125045.

It is an arithmetic number, because the mean of its divisors is an integer number (54013080).

Almost surely, 2^561979257 is an apocalyptic number.

It is an amenable number.

561979257 is a deficient number, since it is larger than the sum of its proper divisors (302230023).

561979257 is a wasteful number, since it uses less digits than its factorization.

561979257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245632.

The product of its digits is 1190700, while the sum is 51.

The square root of 561979257 is about 23706.1016829001. The cubic root of 561979257 is about 825.2269994268.

The spelling of 561979257 in words is "five hundred sixty-one million, nine hundred seventy-nine thousand, two hundred fifty-seven".