632440813 has 2 divisors, whose sum is σ = 632440814. Its totient is φ = 632440812.

The previous prime is 632440811. The next prime is 632440849. The reversal of 632440813 is 318044236.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630361449 + 2079364 = 25107^2 + 1442^2 .

It is a cyclic number.

It is not a de Polignac number, because 632440813 - 2¹ = 632440811 is a prime.

Together with 632440811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (632440811) 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 as a sum of consecutive naturals, namely, 316220406 + 316220407.

It is an arithmetic number, because the mean of its divisors is an integer number (316220407).

Almost surely, 2^632440813 is an apocalyptic number.

It is an amenable number.

632440813 is a deficient number, since it is larger than the sum of its proper divisors (1).

632440813 is an equidigital number, since it uses as much as digits as its factorization.

632440813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 632440813 is about 25148.3759515401. The cubic root of 632440813 is about 858.3675599468.

The spelling of 632440813 in words is "six hundred thirty-two million, four hundred forty thousand, eight hundred thirteen".