2291031 has 16 divisors (see below), whose sum is σ = 3460320. Its totient is φ = 1497600.

The previous prime is 2291017. The next prime is 2291033. The reversal of 2291031 is 1301922.

It is a happy number.

It is not a de Polignac number, because 2291031 - 2⁵ = 2290999 is a prime.

It is a super-2 number, since 2×2291031² = 10497646085922, which contains 22 as substring.

2291031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2290995 and 2291013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291033) 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 15 ways as a sum of consecutive naturals, for example, 631 + ... + 2231.

It is an arithmetic number, because the mean of its divisors is an integer number (216270).

2^2291031 is an apocalyptic number.

2291031 is a deficient number, since it is larger than the sum of its proper divisors (1169289).

2291031 is a wasteful number, since it uses less digits than its factorization.

2291031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2291031 is about 1513.6152086974. The cubic root of 2291031 is about 131.8288069985.

Adding to 2291031 its reverse (1301922), we get a palindrome (3592953).

The spelling of 2291031 in words is "two million, two hundred ninety-one thousand, thirty-one".