561405386 has 4 divisors (see below), whose sum is σ = 842108082. Its totient is φ = 280702692.

The previous prime is 561405373. The next prime is 561405391. The reversal of 561405386 is 683504165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 473889361 + 87516025 = 21769^2 + 9355^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140351345 + ... + 140351348.

Almost surely, 2^561405386 is an apocalyptic number.

561405386 is a deficient number, since it is larger than the sum of its proper divisors (280702696).

561405386 is a wasteful number, since it uses less digits than its factorization.

561405386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280702695.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 561405386 is about 23693.9947244022. The cubic root of 561405386 is about 824.9460073633.

The spelling of 561405386 in words is "five hundred sixty-one million, four hundred five thousand, three hundred eighty-six".