87491247 has 4 divisors (see below), whose sum is σ = 116655000. Its totient is φ = 58327496.

The previous prime is 87491177. The next prime is 87491249. The reversal of 87491247 is 74219478.

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 87491247 - 2⁷ = 87491119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87491199 and 87491208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87491249) 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, 14581872 + ... + 14581877.

It is an arithmetic number, because the mean of its divisors is an integer number (29163750).

Almost surely, 2^87491247 is an apocalyptic number.

87491247 is a deficient number, since it is larger than the sum of its proper divisors (29163753).

87491247 is a wasteful number, since it uses less digits than its factorization.

87491247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29163752.

The product of its digits is 112896, while the sum is 42.

The square root of 87491247 is about 9353.6755877035. The cubic root of 87491247 is about 443.9371969039.

The spelling of 87491247 in words is "eighty-seven million, four hundred ninety-one thousand, two hundred forty-seven".