85725991 has 16 divisors (see below), whose sum is σ = 96707520. Its totient is φ = 75398400.

The previous prime is 85725989. The next prime is 85726009. The reversal of 85725991 is 19952758.

It is a cyclic number.

It is not a de Polignac number, because 85725991 - 2¹ = 85725989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85725901) 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, 121941 + ... + 122641.

It is an arithmetic number, because the mean of its divisors is an integer number (6044220).

Almost surely, 2^85725991 is an apocalyptic number.

85725991 is a deficient number, since it is larger than the sum of its proper divisors (10981529).

85725991 is a wasteful number, since it uses less digits than its factorization.

85725991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146.

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

The square root of 85725991 is about 9258.8331338242. The cubic root of 85725991 is about 440.9312079148.

The spelling of 85725991 in words is "eighty-five million, seven hundred twenty-five thousand, nine hundred ninety-one".