561268901 has 2 divisors, whose sum is σ = 561268902. Its totient is φ = 561268900.

The previous prime is 561268891. The next prime is 561268909. The reversal of 561268901 is 109862165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520296100 + 40972801 = 22810^2 + 6401^2 .

It is a cyclic number.

It is not a de Polignac number, because 561268901 - 2⁶ = 561268837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561268909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280634450 + 280634451.

It is an arithmetic number, because the mean of its divisors is an integer number (280634451).

Almost surely, 2^561268901 is an apocalyptic number.

It is an amenable number.

561268901 is a deficient number, since it is larger than the sum of its proper divisors (1).

561268901 is an equidigital number, since it uses as much as digits as its factorization.

561268901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 561268901 is about 23691.1143891544. The cubic root of 561268901 is about 824.8791502199.

The spelling of 561268901 in words is "five hundred sixty-one million, two hundred sixty-eight thousand, nine hundred one".