87509191791 has 16 divisors (see below), whose sum is σ = 133382859264. Its totient is φ = 49991932704.

The previous prime is 87509191739. The next prime is 87509191801. The reversal of 87509191791 is 19719190578.

It is not a de Polignac number, because 87509191791 - 2¹⁰ = 87509190767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87509195791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 474000 + ... + 632213.

It is an arithmetic number, because the mean of its divisors is an integer number (8336428704).

Almost surely, 2^87509191791 is an apocalyptic number.

87509191791 is a deficient number, since it is larger than the sum of its proper divisors (45873667473).

87509191791 is a wasteful number, since it uses less digits than its factorization.

87509191791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109990.

The product of its (nonzero) digits is 1428840, while the sum is 57.

The spelling of 87509191791 in words is "eighty-seven billion, five hundred nine million, one hundred ninety-one thousand, seven hundred ninety-one".