87392281 has 2 divisors, whose sum is σ = 87392282. Its totient is φ = 87392280.

The previous prime is 87392273. The next prime is 87392311. The reversal of 87392281 is 18229378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84640000 + 2752281 = 9200^2 + 1659^2 .

It is a cyclic number.

It is not a de Polignac number, because 87392281 - 2³ = 87392273 is a prime.

It is a super-2 number, since 2×87392281² = 15274821556765922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87392251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43696140 + 43696141.

It is an arithmetic number, because the mean of its divisors is an integer number (43696141).

Almost surely, 2^87392281 is an apocalyptic number.

It is an amenable number.

87392281 is a deficient number, since it is larger than the sum of its proper divisors (1).

87392281 is an equidigital number, since it uses as much as digits as its factorization.

87392281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 87392281 is about 9348.3838710228. The cubic root of 87392281 is about 443.7697467639.

The spelling of 87392281 in words is "eighty-seven million, three hundred ninety-two thousand, two hundred eighty-one".