87155281 has 8 divisors (see below), whose sum is σ = 89575200. Its totient is φ = 84753312.

The previous prime is 87155221. The next prime is 87155287. The reversal of 87155281 is 18255178.

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-87155281 is a prime.

It is a super-2 number, since 2×87155281² = 15192086012377922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87155281.

It is not an unprimeable number, because it can be changed into a prime (87155287) 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, 5670 + ... + 14368.

It is an arithmetic number, because the mean of its divisors is an integer number (11196900).

Almost surely, 2^87155281 is an apocalyptic number.

It is an amenable number.

87155281 is a deficient number, since it is larger than the sum of its proper divisors (2419919).

87155281 is a wasteful number, since it uses less digits than its factorization.

87155281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8975.

The product of its digits is 22400, while the sum is 37.

The square root of 87155281 is about 9335.6992775046. The cubic root of 87155281 is about 443.3682290482.

The spelling of 87155281 in words is "eighty-seven million, one hundred fifty-five thousand, two hundred eighty-one".