85725251 has 4 divisors (see below), whose sum is σ = 85964400. Its totient is φ = 85486104.

The previous prime is 85725229. The next prime is 85725257. The reversal of 85725251 is 15252758.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85725251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85725257) 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, 119036 + ... + 119753.

It is an arithmetic number, because the mean of its divisors is an integer number (21491100).

Almost surely, 2^85725251 is an apocalyptic number.

85725251 is a deficient number, since it is larger than the sum of its proper divisors (239149).

85725251 is a wasteful number, since it uses less digits than its factorization.

85725251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239148.

The product of its digits is 28000, while the sum is 35.

The square root of 85725251 is about 9258.7931718988. The cubic root of 85725251 is about 440.9299391824.

The spelling of 85725251 in words is "eighty-five million, seven hundred twenty-five thousand, two hundred fifty-one".