2291531 has 8 divisors (see below), whose sum is σ = 2561328. Its totient is φ = 2032000.

The previous prime is 2291491. The next prime is 2291539. The reversal of 2291531 is 1351922.

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 2291531 - 2¹⁸ = 2029387 is a prime.

It is a super-2 number, since 2×2291531² = 10502228647922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2291497 and 2291506.

It is not an unprimeable number, because it can be changed into a prime (2291539) 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, 2090 + ... + 2991.

It is an arithmetic number, because the mean of its divisors is an integer number (320166).

2^2291531 is an apocalyptic number.

2291531 is a deficient number, since it is larger than the sum of its proper divisors (269797).

2291531 is a wasteful number, since it uses less digits than its factorization.

2291531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133.

The product of its digits is 540, while the sum is 23.

The square root of 2291531 is about 1513.7803671603. The cubic root of 2291531 is about 131.8383965107.

The spelling of 2291531 in words is "two million, two hundred ninety-one thousand, five hundred thirty-one".