561612492 has 288 divisors, whose sum is σ = 1805905920. Its totient is φ = 143700480.

The previous prime is 561612487. The next prime is 561612497. The reversal of 561612492 is 294216165.

561612492 is a `hidden beast` number, since 5 + 6 + 161 + 2 + 492 = 666.

It is an interprime number because it is at equal distance from previous prime (561612487) and next prime (561612497).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (561612497) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8382243 + ... + 8382309.

Almost surely, 2^561612492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561612492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902952960).

561612492 is an abundant number, since it is smaller than the sum of its proper divisors (1244293428).

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

561612492 is a wasteful number, since it uses less digits than its factorization.

561612492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 176 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 561612492 is about 23698.3647537124. The cubic root of 561612492 is about 825.0474374927.

It can be divided in two parts, 56161 and 2492, that added together give a triangular number (58653 = T₃₄₂).

The spelling of 561612492 in words is "five hundred sixty-one million, six hundred twelve thousand, four hundred ninety-two".