561167279 has 4 divisors (see below), whose sum is σ = 568854576. Its totient is φ = 553479984.

The previous prime is 561167273. The next prime is 561167291. The reversal of 561167279 is 972761165.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561167279 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 (561167273) 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, 3843539 + ... + 3843684.

It is an arithmetic number, because the mean of its divisors is an integer number (142213644).

Almost surely, 2^561167279 is an apocalyptic number.

561167279 is a deficient number, since it is larger than the sum of its proper divisors (7687297).

561167279 is an equidigital number, since it uses as much as digits as its factorization.

561167279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7687296.

The product of its digits is 158760, while the sum is 44.

The square root of 561167279 is about 23688.9695639131. The cubic root of 561167279 is about 824.8293636687.

The spelling of 561167279 in words is "five hundred sixty-one million, one hundred sixty-seven thousand, two hundred seventy-nine".