85705651 has 4 divisors (see below), whose sum is σ = 86031792. Its totient is φ = 85379512.

The previous prime is 85705649. The next prime is 85705661. The reversal of 85705651 is 15650758.

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 85705651 - 2¹ = 85705649 is a prime.

It is a super-2 number, since 2×85705651² = 14690917226667602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85705651.

It is not an unprimeable number, because it can be changed into a prime (85705661) 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, 162676 + ... + 163201.

It is an arithmetic number, because the mean of its divisors is an integer number (21507948).

Almost surely, 2^85705651 is an apocalyptic number.

85705651 is a deficient number, since it is larger than the sum of its proper divisors (326141).

85705651 is a wasteful number, since it uses less digits than its factorization.

85705651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326140.

The product of its (nonzero) digits is 42000, while the sum is 37.

The square root of 85705651 is about 9257.7346581116. The cubic root of 85705651 is about 440.8963322601.

The spelling of 85705651 in words is "eighty-five million, seven hundred five thousand, six hundred fifty-one".