87491313 has 48 divisors (see below), whose sum is σ = 162408960. Its totient is φ = 46140192.

The previous prime is 87491297. The next prime is 87491323. The reversal of 87491313 is 31319478.

It is a happy number.

It is not a de Polignac number, because 87491313 - 2⁴ = 87491297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87491323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14656 + ... + 19742.

It is an arithmetic number, because the mean of its divisors is an integer number (3383520).

Almost surely, 2^87491313 is an apocalyptic number.

It is an amenable number.

87491313 is a deficient number, since it is larger than the sum of its proper divisors (74917647).

87491313 is a wasteful number, since it uses less digits than its factorization.

87491313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123 (or 5110 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 87491313 is about 9353.6791157277. The cubic root of 87491313 is about 443.9373085335.

The spelling of 87491313 in words is "eighty-seven million, four hundred ninety-one thousand, three hundred thirteen".