85921951 has 4 divisors (see below), whose sum is σ = 89657712. Its totient is φ = 82186192.

The previous prime is 85921919. The next prime is 85921981. The reversal of 85921951 is 15912958.

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 85921951 - 2⁵ = 85921919 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85921981) 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, 1867846 + ... + 1867891.

It is an arithmetic number, because the mean of its divisors is an integer number (22414428).

Almost surely, 2^85921951 is an apocalyptic number.

85921951 is a deficient number, since it is larger than the sum of its proper divisors (3735761).

85921951 is a wasteful number, since it uses less digits than its factorization.

85921951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735760.

The product of its digits is 32400, while the sum is 40.

The square root of 85921951 is about 9269.4094202382. The cubic root of 85921951 is about 441.2669253353.

The spelling of 85921951 in words is "eighty-five million, nine hundred twenty-one thousand, nine hundred fifty-one".