87183881 has 2 divisors, whose sum is σ = 87183882. Its totient is φ = 87183880.

The previous prime is 87183839. The next prime is 87183883. The reversal of 87183881 is 18838178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 3644281 = 9140^2 + 1909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87183881 is a prime.

It is a super-2 number, since 2×87183881² = 15202058212444322, which contains 22 as substring.

Together with 87183883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87183883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43591940 + 43591941.

It is an arithmetic number, because the mean of its divisors is an integer number (43591941).

Almost surely, 2^87183881 is an apocalyptic number.

It is an amenable number.

87183881 is a deficient number, since it is larger than the sum of its proper divisors (1).

87183881 is an equidigital number, since it uses as much as digits as its factorization.

87183881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 44.

The square root of 87183881 is about 9337.2309064304. The cubic root of 87183881 is about 443.4167208300.

The spelling of 87183881 in words is "eighty-seven million, one hundred eighty-three thousand, eight hundred eighty-one".