561871501 has 2 divisors, whose sum is σ = 561871502. Its totient is φ = 561871500.

The previous prime is 561871483. The next prime is 561871537. The reversal of 561871501 is 105178165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301855876 + 260015625 = 17374^2 + 16125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561871501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561871601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280935750 + 280935751.

It is an arithmetic number, because the mean of its divisors is an integer number (280935751).

Almost surely, 2^561871501 is an apocalyptic number.

It is an amenable number.

561871501 is a deficient number, since it is larger than the sum of its proper divisors (1).

561871501 is an equidigital number, since it uses as much as digits as its factorization.

561871501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 34.

The square root of 561871501 is about 23703.8288257404. The cubic root of 561871501 is about 825.1742520205.

The spelling of 561871501 in words is "five hundred sixty-one million, eight hundred seventy-one thousand, five hundred one".