87251813 has 8 divisors (see below), whose sum is σ = 97505856. Its totient is φ = 77384800.

The previous prime is 87251789. The next prime is 87251851. The reversal of 87251813 is 31815278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87251813 is a prime.

It is a super-2 number, since 2×87251813² = 15225757743573938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87251873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96281 + ... + 97182.

It is an arithmetic number, because the mean of its divisors is an integer number (12188232).

Almost surely, 2^87251813 is an apocalyptic number.

It is an amenable number.

87251813 is a deficient number, since it is larger than the sum of its proper divisors (10254043).

87251813 is a wasteful number, since it uses less digits than its factorization.

87251813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193515.

The product of its digits is 13440, while the sum is 35.

The square root of 87251813 is about 9340.8678932956. The cubic root of 87251813 is about 443.5318581855.

The spelling of 87251813 in words is "eighty-seven million, two hundred fifty-one thousand, eight hundred thirteen".