2391531 has 8 divisors (see below), whose sum is σ = 3263040. Its totient is φ = 1557192.

The previous prime is 2391527. The next prime is 2391533. The reversal of 2391531 is 1351932.

It is a happy number.

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

It is not a de Polignac number, because 2391531 - 2² = 2391527 is a prime.

It is a super-2 number, since 2×2391531² = 11438841047922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2391533) 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, 9141 + ... + 9398.

It is an arithmetic number, because the mean of its divisors is an integer number (407880).

2^2391531 is an apocalyptic number.

2391531 is a deficient number, since it is larger than the sum of its proper divisors (871509).

2391531 is a wasteful number, since it uses less digits than its factorization.

2391531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18585.

The product of its digits is 810, while the sum is 24.

The square root of 2391531 is about 1546.4575648882. The cubic root of 2391531 is about 133.7289203102.

It can be divided in two parts, 2391 and 531, that multiplied together give a palindrome (1269621).

The spelling of 2391531 in words is "two million, three hundred ninety-one thousand, five hundred thirty-one".