561258731 has 4 divisors (see below), whose sum is σ = 612282264. Its totient is φ = 510235200.

The previous prime is 561258703. The next prime is 561258749. The reversal of 561258731 is 137852165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561258731 - 2¹⁴ = 561242347 is a prime.

It is a super-2 number, since 2×561258731² = 630022726247460722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561258701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25511750 + ... + 25511771.

It is an arithmetic number, because the mean of its divisors is an integer number (153070566).

Almost surely, 2^561258731 is an apocalyptic number.

561258731 is a deficient number, since it is larger than the sum of its proper divisors (51023533).

561258731 is a wasteful number, since it uses less digits than its factorization.

561258731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51023532.

The product of its digits is 50400, while the sum is 38.

The square root of 561258731 is about 23690.8997507482. The cubic root of 561258731 is about 824.8741680140.

The spelling of 561258731 in words is "five hundred sixty-one million, two hundred fifty-eight thousand, seven hundred thirty-one".