561275501 has 2 divisors, whose sum is σ = 561275502. Its totient is φ = 561275500.

The previous prime is 561275489. The next prime is 561275521. The reversal of 561275501 is 105572165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474804100 + 86471401 = 21790^2 + 9299^2 .

It is a cyclic number.

It is not a de Polignac number, because 561275501 - 2¹⁴ = 561259117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561275521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280637750 + 280637751.

It is an arithmetic number, because the mean of its divisors is an integer number (280637751).

Almost surely, 2^561275501 is an apocalyptic number.

It is an amenable number.

561275501 is a deficient number, since it is larger than the sum of its proper divisors (1).

561275501 is an equidigital number, since it uses as much as digits as its factorization.

561275501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 561275501 is about 23691.2536814749. The cubic root of 561275501 is about 824.8823834776.

The spelling of 561275501 in words is "five hundred sixty-one million, two hundred seventy-five thousand, five hundred one".