2640531 has 8 divisors (see below), whose sum is σ = 3539200. Its totient is φ = 1751112.

The previous prime is 2640527. The next prime is 2640551. The reversal of 2640531 is 1350462.

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 2640531 - 2² = 2640527 is a prime.

It is a super-2 number, since 2×2640531² = 13944807923922, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 2640498 and 2640507.

It is not an unprimeable number, because it can be changed into a prime (2640511) 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, 1615 + ... + 2808.

It is an arithmetic number, because the mean of its divisors is an integer number (442400).

2^2640531 is an apocalyptic number.

2640531 is a deficient number, since it is larger than the sum of its proper divisors (898669).

2640531 is a wasteful number, since it uses less digits than its factorization.

2640531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4625.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2640531 is about 1624.9710766657. The cubic root of 2640531 is about 138.2177302284.

Adding to 2640531 its reverse (1350462), we get a palindrome (3990993).

The spelling of 2640531 in words is "two million, six hundred forty thousand, five hundred thirty-one".