561491936 has 48 divisors (see below), whose sum is σ = 1135134000. Its totient is φ = 273251328.

The previous prime is 561491921. The next prime is 561491951. The reversal of 561491936 is 639194165.

It is an interprime number because it is at equal distance from previous prime (561491921) and next prime (561491951).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534740 + ... + 535788.

It is an arithmetic number, because the mean of its divisors is an integer number (23648625).

Almost surely, 2^561491936 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 561491936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (567567000).

561491936 is an abundant number, since it is smaller than the sum of its proper divisors (573642064).

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

561491936 is a wasteful number, since it uses less digits than its factorization.

561491936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491 (or 1483 counting only the distinct ones).

The product of its digits is 174960, while the sum is 44.

The square root of 561491936 is about 23695.8210661711. The cubic root of 561491936 is about 824.9883982452.

It can be divided in two parts, 56149 and 1936, that added together give a palindrome (58085).

The spelling of 561491936 in words is "five hundred sixty-one million, four hundred ninety-one thousand, nine hundred thirty-six".