87494513 has 4 divisors (see below), whose sum is σ = 87609060. Its totient is φ = 87379968.

The previous prime is 87494503. The next prime is 87494521. The reversal of 87494513 is 31549478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31549478 = 2 ⋅15774739.

It can be written as a sum of positive squares in 2 ways, for example, as 10195249 + 77299264 = 3193^2 + 8792^2 .

It is a cyclic number.

It is not a de Polignac number, because 87494513 - 2²⁶ = 20385649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87494503) 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, 56120 + ... + 57657.

It is an arithmetic number, because the mean of its divisors is an integer number (21902265).

Almost surely, 2^87494513 is an apocalyptic number.

It is an amenable number.

87494513 is a deficient number, since it is larger than the sum of its proper divisors (114547).

87494513 is a wasteful number, since it uses less digits than its factorization.

87494513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114546.

The product of its digits is 120960, while the sum is 41.

The square root of 87494513 is about 9353.8501698498. The cubic root of 87494513 is about 443.9427208121.

The spelling of 87494513 in words is "eighty-seven million, four hundred ninety-four thousand, five hundred thirteen".