561390836 has 6 divisors (see below), whose sum is σ = 982433970. Its totient is φ = 280695416.

The previous prime is 561390803. The next prime is 561390839. The reversal of 561390836 is 638093165.

It can be written as a sum of positive squares in only one way, i.e., 499075600 + 62315236 = 22340^2 + 7894^2 .

It is a junction number, because it is equal to n+sod(n) for n = 561390793 and 561390802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561390839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70173851 + ... + 70173858.

It is an arithmetic number, because the mean of its divisors is an integer number (163738995).

Almost surely, 2^561390836 is an apocalyptic number.

It is an amenable number.

561390836 is a deficient number, since it is larger than the sum of its proper divisors (421043134).

561390836 is a wasteful number, since it uses less digits than its factorization.

561390836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140347713 (or 140347711 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 561390836 is about 23693.6876825875. The cubic root of 561390836 is about 824.9388805655.

The spelling of 561390836 in words is "five hundred sixty-one million, three hundred ninety thousand, eight hundred thirty-six".