561376279 has 2 divisors, whose sum is σ = 561376280. Its totient is φ = 561376278.

The previous prime is 561376267. The next prime is 561376297. The reversal of 561376279 is 972673165.

Together with next prime (561376297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561376279 is a prime.

It is a pancake number, because a pancake can be divided into 561376279 parts by 33507 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561376379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280688139 + 280688140.

It is an arithmetic number, because the mean of its divisors is an integer number (280688140).

Almost surely, 2^561376279 is an apocalyptic number.

561376279 is a deficient number, since it is larger than the sum of its proper divisors (1).

561376279 is an equidigital number, since it uses as much as digits as its factorization.

561376279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 46.

The square root of 561376279 is about 23693.3804890733. The cubic root of 561376279 is about 824.9317502157.

The spelling of 561376279 in words is "five hundred sixty-one million, three hundred seventy-six thousand, two hundred seventy-nine".