85872251 has 2 divisors, whose sum is σ = 85872252. Its totient is φ = 85872250.

The previous prime is 85872239. The next prime is 85872307. The reversal of 85872251 is 15227858.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85872251 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85872221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42936125 + 42936126.

It is an arithmetic number, because the mean of its divisors is an integer number (42936126).

Almost surely, 2^85872251 is an apocalyptic number.

85872251 is a deficient number, since it is larger than the sum of its proper divisors (1).

85872251 is an equidigital number, since it uses as much as digits as its factorization.

85872251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44800, while the sum is 38.

The square root of 85872251 is about 9266.7281712587. The cubic root of 85872251 is about 441.1818279656.

The spelling of 85872251 in words is "eighty-five million, eight hundred seventy-two thousand, two hundred fifty-one".