86501921 has 4 divisors (see below), whose sum is σ = 94365744. Its totient is φ = 78638100.

The previous prime is 86501911. The next prime is 86501941. The reversal of 86501921 is 12910568.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86501921 - 2¹⁴ = 86485537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86501911) 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 3 ways as a sum of consecutive naturals, for example, 3931895 + ... + 3931916.

It is an arithmetic number, because the mean of its divisors is an integer number (23591436).

Almost surely, 2^86501921 is an apocalyptic number.

It is an amenable number.

86501921 is a deficient number, since it is larger than the sum of its proper divisors (7863823).

86501921 is a wasteful number, since it uses less digits than its factorization.

86501921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7863822.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 86501921 is about 9300.6408918956. The cubic root of 86501921 is about 442.2575449420.

The spelling of 86501921 in words is "eighty-six million, five hundred one thousand, nine hundred twenty-one".