87255191 has 2 divisors, whose sum is σ = 87255192. Its totient is φ = 87255190.

The previous prime is 87255187. The next prime is 87255209. The reversal of 87255191 is 19155278.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87255191 - 2² = 87255187 is a prime.

It is a super-2 number, since 2×87255191² = 15226936712892962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87255151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43627595 + 43627596.

It is an arithmetic number, because the mean of its divisors is an integer number (43627596).

Almost surely, 2^87255191 is an apocalyptic number.

87255191 is a deficient number, since it is larger than the sum of its proper divisors (1).

87255191 is an equidigital number, since it uses as much as digits as its factorization.

87255191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 38.

The square root of 87255191 is about 9341.0487098612. The cubic root of 87255191 is about 443.5375819684.

The spelling of 87255191 in words is "eighty-seven million, two hundred fifty-five thousand, one hundred ninety-one".