87281519 has 16 divisors (see below), whose sum is σ = 99856512. Its totient is φ = 75575808.

The previous prime is 87281419. The next prime is 87281521. The reversal of 87281519 is 91518278.

It is a cyclic number.

It is not a de Polignac number, because 87281519 - 2¹² = 87277423 is a prime.

It is a super-2 number, since 2×87281519² = 15236127117894722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87281549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101897 + ... + 102749.

It is an arithmetic number, because the mean of its divisors is an integer number (6241032).

Almost surely, 2^87281519 is an apocalyptic number.

87281519 is a deficient number, since it is larger than the sum of its proper divisors (12574993).

87281519 is a wasteful number, since it uses less digits than its factorization.

87281519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its digits is 40320, while the sum is 41.

The square root of 87281519 is about 9342.4578671782. The cubic root of 87281519 is about 443.5821878461.

The spelling of 87281519 in words is "eighty-seven million, two hundred eighty-one thousand, five hundred nineteen".