1631432813 has 2 divisors, whose sum is σ = 1631432814. Its totient is φ = 1631432812.

The previous prime is 1631432801. The next prime is 1631432833. The reversal of 1631432813 is 3182341361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1361093449 + 270339364 = 36893^2 + 16442^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631432813 - 2⁴ = 1631432797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1631432813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631432833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815716406 + 815716407.

It is an arithmetic number, because the mean of its divisors is an integer number (815716407).

Almost surely, 2^1631432813 is an apocalyptic number.

It is an amenable number.

1631432813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631432813 is an equidigital number, since it uses as much as digits as its factorization.

1631432813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 1631432813 is about 40390.9991582283. Note that the first 3 decimals coincide. The cubic root of 1631432813 is about 1177.2166547314.

The spelling of 1631432813 in words is "one billion, six hundred thirty-one million, four hundred thirty-two thousand, eight hundred thirteen".