1631632813 has 2 divisors, whose sum is σ = 1631632814. Its totient is φ = 1631632812.

The previous prime is 1631632789. The next prime is 1631632837. The reversal of 1631632813 is 3182361361.

1631632813 = 28562² + 28563².

It is a balanced prime because it is at equal distance from previous prime (1631632789) and next prime (1631632837).

It can be written as a sum of positive squares in only one way, i.e., 815844969 + 815787844 = 28563^2 + 28562^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631632813 - 2²⁹ = 1094761901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631632853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815816406 + 815816407.

It is an arithmetic number, because the mean of its divisors is an integer number (815816407).

Almost surely, 2^1631632813 is an apocalyptic number.

1631632813 is the 28563-rd centered square number.

It is an amenable number.

1631632813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631632813 is an equidigital number, since it uses as much as digits as its factorization.

1631632813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 1631632813 is about 40393.4748814706. The cubic root of 1631632813 is about 1177.2647584001.

The spelling of 1631632813 in words is "one billion, six hundred thirty-one million, six hundred thirty-two thousand, eight hundred thirteen".