2291957 has 8 divisors (see below), whose sum is σ = 2511000. Its totient is φ = 2082304.

The previous prime is 2291929. The next prime is 2291959. The reversal of 2291957 is 7591922.

It can be written as a sum of positive squares in 4 ways, for example, as 1343281 + 948676 = 1159^2 + 974^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2291957 - 2⁶ = 2291893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291959) 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 7 ways as a sum of consecutive naturals, for example, 1832 + ... + 2817.

It is an arithmetic number, because the mean of its divisors is an integer number (313875).

2^2291957 is an apocalyptic number.

It is an amenable number.

2291957 is a deficient number, since it is larger than the sum of its proper divisors (219043).

2291957 is a wasteful number, since it uses less digits than its factorization.

2291957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695.

The product of its digits is 11340, while the sum is 35.

The square root of 2291957 is about 1513.9210679557. The cubic root of 2291957 is about 131.8465656746.

Subtracting from 2291957 its sum of digits (35), we obtain a palindrome (2291922).

The spelling of 2291957 in words is "two million, two hundred ninety-one thousand, nine hundred fifty-seven".