2091331 has 4 divisors (see below), whose sum is σ = 2281464. Its totient is φ = 1901200.

The previous prime is 2091319. The next prime is 2091337. The reversal of 2091331 is 1331902.

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 2091331 - 2¹³ = 2083139 is a prime.

It is a super-2 number, since 2×2091331² = 8747330703122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2091299 and 2091308.

It is not an unprimeable number, because it can be changed into a prime (2091337) 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, 95050 + ... + 95071.

It is an arithmetic number, because the mean of its divisors is an integer number (570366).

2^2091331 is an apocalyptic number.

2091331 is a deficient number, since it is larger than the sum of its proper divisors (190133).

2091331 is a wasteful number, since it uses less digits than its factorization.

2091331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190132.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 2091331 is about 1446.1434921888. The cubic root of 2091331 is about 127.8814617097.

It can be divided in two parts, 209 and 1331, that added together give a triangular number (1540 = T₅₅).

The spelling of 2091331 in words is "two million, ninety-one thousand, three hundred thirty-one".