87173154691 has 4 divisors (see below), whose sum is σ = 99626462512. Its totient is φ = 74719846872.

The previous prime is 87173154683. The next prime is 87173154701. The reversal of 87173154691 is 19645137178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87173154691 - 2³ = 87173154683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87173154661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6226653900 + ... + 6226653913.

It is an arithmetic number, because the mean of its divisors is an integer number (24906615628).

Almost surely, 2^87173154691 is an apocalyptic number.

87173154691 is a deficient number, since it is larger than the sum of its proper divisors (12453307821).

87173154691 is a wasteful number, since it uses less digits than its factorization.

87173154691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12453307820.

The product of its digits is 1270080, while the sum is 52.

The spelling of 87173154691 in words is "eighty-seven billion, one hundred seventy-three million, one hundred fifty-four thousand, six hundred ninety-one".