561541398 has 24 divisors (see below), whose sum is σ = 1234464504. Its totient is φ = 170163840.

The previous prime is 561541381. The next prime is 561541403. The reversal of 561541398 is 893145165.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 386011 + ... + 387462.

It is an arithmetic number, because the mean of its divisors is an integer number (51436021).

Almost surely, 2^561541398 is an apocalyptic number.

561541398 is an abundant number, since it is smaller than the sum of its proper divisors (672923106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561541398 is a wasteful number, since it uses less digits than its factorization.

561541398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773500 (or 773489 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 561541398 is about 23696.8647293265. The cubic root of 561541398 is about 825.0126220291.

The spelling of 561541398 in words is "five hundred sixty-one million, five hundred forty-one thousand, three hundred ninety-eight".