87581249 has 4 divisors (see below), whose sum is σ = 100092864. Its totient is φ = 75069636.

The previous prime is 87581233. The next prime is 87581321. The reversal of 87581249 is 94218578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87581249 - 2⁴ = 87581233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87581749) 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, 6255797 + ... + 6255810.

It is an arithmetic number, because the mean of its divisors is an integer number (25023216).

Almost surely, 2^87581249 is an apocalyptic number.

It is an amenable number.

87581249 is a deficient number, since it is larger than the sum of its proper divisors (12511615).

87581249 is a wasteful number, since it uses less digits than its factorization.

87581249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12511614.

The product of its digits is 161280, while the sum is 44.

The square root of 87581249 is about 9358.4854009610. The cubic root of 87581249 is about 444.0893703848.

The spelling of 87581249 in words is "eighty-seven million, five hundred eighty-one thousand, two hundred forty-nine".