2640435231 has 16 divisors (see below), whose sum is σ = 4109128704. Its totient is φ = 1476717024.

The previous prime is 2640435211. The next prime is 2640435251. The reversal of 2640435231 is 1325340462.

It is an interprime number because it is at equal distance from previous prime (2640435211) and next prime (2640435251).

It is not a de Polignac number, because 2640435231 - 2²⁶ = 2573326367 is a prime.

It is a super-2 number, since 2×2640435231² = 13943796418212046722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640435211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1336620 + ... + 1338593.

It is an arithmetic number, because the mean of its divisors is an integer number (256820544).

Almost surely, 2^2640435231 is an apocalyptic number.

2640435231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2640435231 is a deficient number, since it is larger than the sum of its proper divisors (1468693473).

2640435231 is a wasteful number, since it uses less digits than its factorization.

2640435231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675270.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 2640435231 is about 51385.1654760399. The cubic root of 2640435231 is about 1382.1605920918.

Adding to 2640435231 its reverse (1325340462), we get a palindrome (3965775693).

The spelling of 2640435231 in words is "two billion, six hundred forty million, four hundred thirty-five thousand, two hundred thirty-one".