86021291 has 4 divisors (see below), whose sum is σ = 86698752. Its totient is φ = 85343832.

The previous prime is 86021261. The next prime is 86021329. The reversal of 86021291 is 19212068.

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 86021291 - 2¹⁰ = 86020267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86021261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338540 + ... + 338793.

It is an arithmetic number, because the mean of its divisors is an integer number (21674688).

Almost surely, 2^86021291 is an apocalyptic number.

86021291 is a deficient number, since it is larger than the sum of its proper divisors (677461).

86021291 is a wasteful number, since it uses less digits than its factorization.

86021291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677460.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 86021291 is about 9274.7663582432. The cubic root of 86021291 is about 441.4369190447.

The spelling of 86021291 in words is "eighty-six million, twenty-one thousand, two hundred ninety-one".