561525987 has 8 divisors (see below), whose sum is σ = 816765120. Its totient is φ = 340318760.

The previous prime is 561525983. The next prime is 561526073. The reversal of 561525987 is 789525165.

It is a happy number.

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 561525987 - 2² = 561525983 is a prime.

It is a super-2 number, since 2×561525987² = 630622868152648338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561525983) 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, 8507937 + ... + 8508002.

It is an arithmetic number, because the mean of its divisors is an integer number (102095640).

Almost surely, 2^561525987 is an apocalyptic number.

561525987 is a deficient number, since it is larger than the sum of its proper divisors (255239133).

561525987 is a wasteful number, since it uses less digits than its factorization.

561525987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17015953.

The product of its digits is 756000, while the sum is 48.

The square root of 561525987 is about 23696.5395574966. The cubic root of 561525987 is about 825.0050747163.

The spelling of 561525987 in words is "five hundred sixty-one million, five hundred twenty-five thousand, nine hundred eighty-seven".