87120091 has 2 divisors, whose sum is σ = 87120092. Its totient is φ = 87120090.

The previous prime is 87120029. The next prime is 87120127. The reversal of 87120091 is 19002178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87120091 - 2²³ = 78731483 is a prime.

It is not a weakly prime, because it can be changed into another prime (87120191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43560045 + 43560046.

It is an arithmetic number, because the mean of its divisors is an integer number (43560046).

Almost surely, 2^87120091 is an apocalyptic number.

87120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

87120091 is an equidigital number, since it uses as much as digits as its factorization.

87120091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 87120091 is about 9333.8143864124. The cubic root of 87120091 is about 443.3085492517.

The spelling of 87120091 in words is "eighty-seven million, one hundred twenty thousand, ninety-one".