87169091391 has 24 divisors (see below), whose sum is σ = 126945608400. Its totient is φ = 57636343296.

The previous prime is 87169091371. The next prime is 87169091413. The reversal of 87169091391 is 19319096178.

It is a happy number.

87169091391 is a `hidden beast` number, since 8 + 7 + 169 + 0 + 91 + 391 = 666.

It is not a de Polignac number, because 87169091391 - 2⁶ = 87169091327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87169091371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 854200 + ... + 950786.

It is an arithmetic number, because the mean of its divisors is an integer number (5289400350).

Almost surely, 2^87169091391 is an apocalyptic number.

87169091391 is a deficient number, since it is larger than the sum of its proper divisors (39776517009).

87169091391 is a wasteful number, since it uses less digits than its factorization.

87169091391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97415 (or 97412 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 87169091391 in words is "eighty-seven billion, one hundred sixty-nine million, ninety-one thousand, three hundred ninety-one".