561731279 has 4 divisors (see below), whose sum is σ = 561865080. Its totient is φ = 561597480.

The previous prime is 561731251. The next prime is 561731281. The reversal of 561731279 is 972137165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 972137165 = 5 ⋅194427433.

It is a cyclic number.

It is not a de Polignac number, because 561731279 - 2¹⁶ = 561665743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561731579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60392 + ... + 69069.

It is an arithmetic number, because the mean of its divisors is an integer number (140466270).

Almost surely, 2^561731279 is an apocalyptic number.

561731279 is a deficient number, since it is larger than the sum of its proper divisors (133801).

561731279 is a wasteful number, since it uses less digits than its factorization.

561731279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133800.

The product of its digits is 79380, while the sum is 41.

The square root of 561731279 is about 23700.8708489794. The cubic root of 561731279 is about 825.1056021539.

The spelling of 561731279 in words is "five hundred sixty-one million, seven hundred thirty-one thousand, two hundred seventy-nine".