561738194 has 4 divisors (see below), whose sum is σ = 842607294. Its totient is φ = 280869096.

The previous prime is 561738179. The next prime is 561738209. The reversal of 561738194 is 491837165.

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

It is an interprime number because it is at equal distance from previous prime (561738179) and next prime (561738209).

It can be written as a sum of positive squares in only one way, i.e., 561073969 + 664225 = 23687^2 + 815^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140434547 + ... + 140434550.

Almost surely, 2^561738194 is an apocalyptic number.

561738194 is a deficient number, since it is larger than the sum of its proper divisors (280869100).

561738194 is a wasteful number, since it uses less digits than its factorization.

561738194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280869099.

The product of its digits is 181440, while the sum is 44.

The square root of 561738194 is about 23701.0167292460. The cubic root of 561738194 is about 825.1089878664.

The spelling of 561738194 in words is "five hundred sixty-one million, seven hundred thirty-eight thousand, one hundred ninety-four".