86681951 has 4 divisors (see below), whose sum is σ = 86700600. Its totient is φ = 86663304.

The previous prime is 86681941. The next prime is 86681953. The reversal of 86681951 is 15918668.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86681951 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 (86681953) 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, 3905 + ... + 13733.

It is an arithmetic number, because the mean of its divisors is an integer number (21675150).

Almost surely, 2^86681951 is an apocalyptic number.

86681951 is a deficient number, since it is larger than the sum of its proper divisors (18649).

86681951 is an equidigital number, since it uses as much as digits as its factorization.

86681951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18648.

The product of its digits is 103680, while the sum is 44.

The square root of 86681951 is about 9310.3142267058. The cubic root of 86681951 is about 442.5641448926.

The spelling of 86681951 in words is "eighty-six million, six hundred eighty-one thousand, nine hundred fifty-one".