86921997 has 8 divisors (see below), whose sum is σ = 116590656. Its totient is φ = 57600672.

The previous prime is 86921983. The next prime is 86922001. The reversal of 86921997 is 79912968.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 86921997 - 2⁸ = 86921741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86921297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86248 + ... + 87249.

It is an arithmetic number, because the mean of its divisors is an integer number (14573832).

Almost surely, 2^86921997 is an apocalyptic number.

It is an amenable number.

86921997 is a deficient number, since it is larger than the sum of its proper divisors (29668659).

86921997 is a wasteful number, since it uses less digits than its factorization.

86921997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173667.

The product of its digits is 489888, while the sum is 51.

The square root of 86921997 is about 9323.1967157193. The cubic root of 86921997 is about 442.9722953662.

The spelling of 86921997 in words is "eighty-six million, nine hundred twenty-one thousand, nine hundred ninety-seven".