561582987 has 8 divisors (see below), whose sum is σ = 855745536. Its totient is φ = 320904552.

The previous prime is 561582977. The next prime is 561582991. The reversal of 561582987 is 789285165.

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

It is not a de Polignac number, because 561582987 - 2¹⁰ = 561581963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561582977) 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, 13371003 + ... + 13371044.

It is an arithmetic number, because the mean of its divisors is an integer number (106968192).

Almost surely, 2^561582987 is an apocalyptic number.

561582987 is a deficient number, since it is larger than the sum of its proper divisors (294162549).

561582987 is a wasteful number, since it uses less digits than its factorization.

561582987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26742057.

The product of its digits is 1209600, while the sum is 51.

The square root of 561582987 is about 23697.7422342298. The cubic root of 561582987 is about 825.0329889472.

The spelling of 561582987 in words is "five hundred sixty-one million, five hundred eighty-two thousand, nine hundred eighty-seven".