2431640621 has 4 divisors (see below), whose sum is σ = 2471503644. Its totient is φ = 2391777600.

The previous prime is 2431640599. The next prime is 2431640623. The reversal of 2431640621 is 1260461342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 638118121 + 1793522500 = 25261^2 + 42350^2 .

It is a cyclic number.

It is not a de Polignac number, because 2431640621 - 2⁶ = 2431640557 is a prime.

It is a super-2 number, since 2×2431640621² = 11825752219394531282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2431640623) 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 3 ways as a sum of consecutive naturals, for example, 19931420 + ... + 19931541.

It is an arithmetic number, because the mean of its divisors is an integer number (617875911).

Almost surely, 2^2431640621 is an apocalyptic number.

It is an amenable number.

2431640621 is a deficient number, since it is larger than the sum of its proper divisors (39863023).

2431640621 is an equidigital number, since it uses as much as digits as its factorization.

2431640621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39863022.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 2431640621 is about 49311.6682033776. The cubic root of 2431640621 is about 1344.7239191407.

The spelling of 2431640621 in words is "two billion, four hundred thirty-one million, six hundred forty thousand, six hundred twenty-one".