561481637 has 8 divisors (see below), whose sum is σ = 577567200. Its totient is φ = 545618160.

The previous prime is 561481633. The next prime is 561481639. The reversal of 561481637 is 736184165.

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

It is not a de Polignac number, because 561481637 - 2² = 561481633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561481594 and 561481603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561481631) 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, 50387 + ... + 60512.

It is an arithmetic number, because the mean of its divisors is an integer number (72195900).

Almost surely, 2^561481637 is an apocalyptic number.

It is an amenable number.

561481637 is a deficient number, since it is larger than the sum of its proper divisors (16085563).

561481637 is a wasteful number, since it uses less digits than its factorization.

561481637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111043.

The product of its digits is 120960, while the sum is 41.

The square root of 561481637 is about 23695.6037483749. The cubic root of 561481637 is about 824.9833541790.

The spelling of 561481637 in words is "five hundred sixty-one million, four hundred eighty-one thousand, six hundred thirty-seven".