86251921 has 8 divisors (see below), whose sum is σ = 101238080. Its totient is φ = 71931888.

The previous prime is 86251903. The next prime is 86251933. The reversal of 86251921 is 12915268.

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

It is not a de Polignac number, because 86251921 - 2¹⁹ = 85727633 is a prime.

It is a super-3 number, since 3×86251921³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86251901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166251 + ... + 166768.

It is an arithmetic number, because the mean of its divisors is an integer number (12654760).

Almost surely, 2^86251921 is an apocalyptic number.

It is an amenable number.

86251921 is a deficient number, since it is larger than the sum of its proper divisors (14986159).

86251921 is a wasteful number, since it uses less digits than its factorization.

86251921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333063.

The product of its digits is 8640, while the sum is 34.

The square root of 86251921 is about 9287.1912330909. The cubic root of 86251921 is about 441.8310762937.

The spelling of 86251921 in words is "eighty-six million, two hundred fifty-one thousand, nine hundred twenty-one".