87091197 has 16 divisors (see below), whose sum is σ = 117627840. Its totient is φ = 57313152.

The previous prime is 87091181. The next prime is 87091201. The reversal of 87091197 is 79119078.

It is a happy number.

It is not a de Polignac number, because 87091197 - 2⁴ = 87091181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87091157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83793 + ... + 84825.

It is an arithmetic number, because the mean of its divisors is an integer number (7351740).

Almost surely, 2^87091197 is an apocalyptic number.

It is an amenable number.

87091197 is a deficient number, since it is larger than the sum of its proper divisors (30536643).

87091197 is a wasteful number, since it uses less digits than its factorization.

87091197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 87091197 is about 9332.2664449747. The cubic root of 87091197 is about 443.2595350179.

The spelling of 87091197 in words is "eighty-seven million, ninety-one thousand, one hundred ninety-seven".