85901681491 has 4 divisors (see below), whose sum is σ = 89636537232. Its totient is φ = 82166825752.

The previous prime is 85901681461. The next prime is 85901681539. The reversal of 85901681491 is 19418610958.

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 85901681491 - 2⁹ = 85901680979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85901681461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1867427836 + ... + 1867427881.

It is an arithmetic number, because the mean of its divisors is an integer number (22409134308).

Almost surely, 2^85901681491 is an apocalyptic number.

85901681491 is a deficient number, since it is larger than the sum of its proper divisors (3734855741).

85901681491 is a wasteful number, since it uses less digits than its factorization.

85901681491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3734855740.

The product of its (nonzero) digits is 622080, while the sum is 52.

The spelling of 85901681491 in words is "eighty-five billion, nine hundred one million, six hundred eighty-one thousand, four hundred ninety-one".