85621751 has 4 divisors (see below), whose sum is σ = 85640952. Its totient is φ = 85602552.

The previous prime is 85621727. The next prime is 85621763. The reversal of 85621751 is 15712658.

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 85621751 - 2⁶ = 85621687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85621051) 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, 965 + ... + 13121.

It is an arithmetic number, because the mean of its divisors is an integer number (21410238).

Almost surely, 2^85621751 is an apocalyptic number.

85621751 is a deficient number, since it is larger than the sum of its proper divisors (19201).

85621751 is a wasteful number, since it uses less digits than its factorization.

85621751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19200.

The product of its digits is 16800, while the sum is 35.

The square root of 85621751 is about 9253.2022024810. The cubic root of 85621751 is about 440.7524161199.

The spelling of 85621751 in words is "eighty-five million, six hundred twenty-one thousand, seven hundred fifty-one".