561020197 has 2 divisors, whose sum is σ = 561020198. Its totient is φ = 561020196.

The previous prime is 561020177. The next prime is 561020227. The reversal of 561020197 is 791020165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521254561 + 39765636 = 22831^2 + 6306^2 .

It is a cyclic number.

It is not a de Polignac number, because 561020197 - 2²³ = 552631589 is a prime.

It is a super-2 number, since 2×561020197² = 629487322883837618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561020137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280510098 + 280510099.

It is an arithmetic number, because the mean of its divisors is an integer number (280510099).

Almost surely, 2^561020197 is an apocalyptic number.

It is an amenable number.

561020197 is a deficient number, since it is larger than the sum of its proper divisors (1).

561020197 is an equidigital number, since it uses as much as digits as its factorization.

561020197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 561020197 is about 23685.8649198209. The cubic root of 561020197 is about 824.7572947523.

The spelling of 561020197 in words is "five hundred sixty-one million, twenty thousand, one hundred ninety-seven".