85251643 has 4 divisors (see below), whose sum is σ = 88001728. Its totient is φ = 82501560.

The previous prime is 85251641. The next prime is 85251653. The reversal of 85251643 is 34615258.

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 85251643 - 2¹ = 85251641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85251599 and 85251608.

It is not an unprimeable number, because it can be changed into a prime (85251641) 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, 1374996 + ... + 1375057.

It is an arithmetic number, because the mean of its divisors is an integer number (22000432).

Almost surely, 2^85251643 is an apocalyptic number.

85251643 is a deficient number, since it is larger than the sum of its proper divisors (2750085).

85251643 is a wasteful number, since it uses less digits than its factorization.

85251643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750084.

The product of its digits is 28800, while the sum is 34.

The square root of 85251643 is about 9233.1816293193. The cubic root of 85251643 is about 440.1164344064.

The spelling of 85251643 in words is "eighty-five million, two hundred fifty-one thousand, six hundred forty-three".