561492181 has 8 divisors (see below), whose sum is σ = 581366528. Its totient is φ = 541728000.

The previous prime is 561492179. The next prime is 561492187. The reversal of 561492181 is 181294165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561492181 - 2¹ = 561492179 is a prime.

It is a super-2 number, since 2×561492181² = 630546938648273522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561492181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561492187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17100 + ... + 37621.

It is an arithmetic number, because the mean of its divisors is an integer number (72670816).

It is a Poulet number, since it divides 2^561492180-1.

Almost surely, 2^561492181 is an apocalyptic number.

It is an amenable number.

561492181 is a deficient number, since it is larger than the sum of its proper divisors (19874347).

561492181 is a wasteful number, since it uses less digits than its factorization.

561492181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55083.

The product of its digits is 17280, while the sum is 37.

The square root of 561492181 is about 23695.8262358585. The cubic root of 561492181 is about 824.9885182363.

The spelling of 561492181 in words is "five hundred sixty-one million, four hundred ninety-two thousand, one hundred eighty-one".