561237587 has 4 divisors (see below), whose sum is σ = 562466136. Its totient is φ = 560009040.

The previous prime is 561237583. The next prime is 561237601. The reversal of 561237587 is 785732165.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561237587 - 2² = 561237583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561237583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613589 + ... + 614502.

It is an arithmetic number, because the mean of its divisors is an integer number (140616534).

Almost surely, 2^561237587 is an apocalyptic number.

561237587 is a deficient number, since it is larger than the sum of its proper divisors (1228549).

561237587 is a wasteful number, since it uses less digits than its factorization.

561237587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228548.

The product of its digits is 352800, while the sum is 44.

The square root of 561237587 is about 23690.4534992473. The cubic root of 561237587 is about 824.8638095361.

The spelling of 561237587 in words is "five hundred sixty-one million, two hundred thirty-seven thousand, five hundred eighty-seven".