3215991 has 8 divisors (see below), whose sum is σ = 4302064. Its totient is φ = 2136960.

The previous prime is 3215983. The next prime is 3216007. The reversal of 3215991 is 1995123.

3215991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3215991 - 2³ = 3215983 is a prime.

It is a super-2 number, since 2×3215991² = 20685196224162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3215911) 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 7 ways as a sum of consecutive naturals, for example, 580 + ... + 2601.

It is an arithmetic number, because the mean of its divisors is an integer number (537758).

Almost surely, 2^3215991 is an apocalyptic number.

3215991 is a deficient number, since it is larger than the sum of its proper divisors (1086073).

3215991 is a wasteful number, since it uses less digits than its factorization.

3215991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521.

The product of its digits is 2430, while the sum is 30.

The square root of 3215991 is about 1793.3184324040. The cubic root of 3215991 is about 147.6063161492.

The spelling of 3215991 in words is "three million, two hundred fifteen thousand, nine hundred ninety-one".