3161991 has 8 divisors (see below), whose sum is σ = 4818304. Its totient is φ = 1806840.

The previous prime is 3161953. The next prime is 3161993. The reversal of 3161991 is 1991613.

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

It is not a de Polignac number, because 3161991 - 2⁹ = 3161479 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3161993) 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, 75265 + ... + 75306.

It is an arithmetic number, because the mean of its divisors is an integer number (602288).

Almost surely, 2^3161991 is an apocalyptic number.

3161991 is a deficient number, since it is larger than the sum of its proper divisors (1656313).

3161991 is a wasteful number, since it uses less digits than its factorization.

3161991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150581.

The product of its digits is 1458, while the sum is 30.

The square root of 3161991 is about 1778.1988077828. The cubic root of 3161991 is about 146.7754914327.

The spelling of 3161991 in words is "three million, one hundred sixty-one thousand, nine hundred ninety-one".