86851091 has 4 divisors (see below), whose sum is σ = 87648000. Its totient is φ = 86054184.

The previous prime is 86851087. The next prime is 86851097. The reversal of 86851091 is 19015868.

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 86851091 - 2² = 86851087 is a prime.

It is a super-2 number, since 2×86851091² = 15086224015780562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86851097) 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, 398291 + ... + 398508.

It is an arithmetic number, because the mean of its divisors is an integer number (21912000).

Almost surely, 2^86851091 is an apocalyptic number.

86851091 is a deficient number, since it is larger than the sum of its proper divisors (796909).

86851091 is a wasteful number, since it uses less digits than its factorization.

86851091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796908.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 86851091 is about 9319.3932742427. The cubic root of 86851091 is about 442.8518121007.

The spelling of 86851091 in words is "eighty-six million, eight hundred fifty-one thousand, ninety-one".