561997049 has 2 divisors, whose sum is σ = 561997050. Its totient is φ = 561997048.

The previous prime is 561997031. The next prime is 561997081. The reversal of 561997049 is 940799165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476767225 + 85229824 = 21835^2 + 9232^2 .

It is a cyclic number.

It is not a de Polignac number, because 561997049 - 2⁸ = 561996793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561996988 and 561997006.

It is not a weakly prime, because it can be changed into another prime (561997349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280998524 + 280998525.

It is an arithmetic number, because the mean of its divisors is an integer number (280998525).

Almost surely, 2^561997049 is an apocalyptic number.

It is an amenable number.

561997049 is a deficient number, since it is larger than the sum of its proper divisors (1).

561997049 is an equidigital number, since it uses as much as digits as its factorization.

561997049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 561997049 is about 23706.4769419667. The cubic root of 561997049 is about 825.2357081017.

The spelling of 561997049 in words is "five hundred sixty-one million, nine hundred ninety-seven thousand, forty-nine".