561497197 has 2 divisors, whose sum is σ = 561497198. Its totient is φ = 561497196.

The previous prime is 561497171. The next prime is 561497201. The reversal of 561497197 is 791794165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310781641 + 250715556 = 17629^2 + 15834^2 .

It is a cyclic number.

It is not a de Polignac number, because 561497197 - 2¹⁵ = 561464429 is a prime.

It is a super-4 number, since 4×561497197⁴ (a number of 36 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 561497197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561497897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280748598 + 280748599.

It is an arithmetic number, because the mean of its divisors is an integer number (280748599).

Almost surely, 2^561497197 is an apocalyptic number.

It is an amenable number.

561497197 is a deficient number, since it is larger than the sum of its proper divisors (1).

561497197 is an equidigital number, since it uses as much as digits as its factorization.

561497197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 49.

The square root of 561497197 is about 23695.9320770465. The cubic root of 561497197 is about 824.9909748630.

The spelling of 561497197 in words is "five hundred sixty-one million, four hundred ninety-seven thousand, one hundred ninety-seven".