85391532191 has 4 divisors (see below), whose sum is σ = 97590322512. Its totient is φ = 73192741872.

The previous prime is 85391532181. The next prime is 85391532271. The reversal of 85391532191 is 19123519358.

It is a happy number.

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 85391532191 - 2¹⁰ = 85391531167 is a prime.

It is a super-3 number, since 3×85391532191³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85391532101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6099395150 + ... + 6099395163.

It is an arithmetic number, because the mean of its divisors is an integer number (24397580628).

Almost surely, 2^85391532191 is an apocalyptic number.

85391532191 is a deficient number, since it is larger than the sum of its proper divisors (12198790321).

85391532191 is a wasteful number, since it uses less digits than its factorization.

85391532191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12198790320.

The product of its digits is 291600, while the sum is 47.

The spelling of 85391532191 in words is "eighty-five billion, three hundred ninety-one million, five hundred thirty-two thousand, one hundred ninety-one".