85972591 has 4 divisors (see below), whose sum is σ = 87255832. Its totient is φ = 84689352.

The previous prime is 85972589. The next prime is 85972603. The reversal of 85972591 is 19527958.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19527958 = 2 ⋅9763979.

It is a cyclic number.

It is not a de Polignac number, because 85972591 - 2¹ = 85972589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85922591) 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, 641520 + ... + 641653.

It is an arithmetic number, because the mean of its divisors is an integer number (21813958).

Almost surely, 2^85972591 is an apocalyptic number.

85972591 is a deficient number, since it is larger than the sum of its proper divisors (1283241).

85972591 is a wasteful number, since it uses less digits than its factorization.

85972591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283240.

The product of its digits is 226800, while the sum is 46.

The square root of 85972591 is about 9272.1405834899. The cubic root of 85972591 is about 441.3535984469.

The spelling of 85972591 in words is "eighty-five million, nine hundred seventy-two thousand, five hundred ninety-one".