1642372813 has 2 divisors, whose sum is σ = 1642372814. Its totient is φ = 1642372812.

The previous prime is 1642372789. The next prime is 1642372843. The reversal of 1642372813 is 3182732461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1186251364 + 456121449 = 34442^2 + 21357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642372813 - 2²¹ = 1640275661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642372843) 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, 821186406 + 821186407.

It is an arithmetic number, because the mean of its divisors is an integer number (821186407).

Almost surely, 2^1642372813 is an apocalyptic number.

It is an amenable number.

1642372813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642372813 is an equidigital number, since it uses as much as digits as its factorization.

1642372813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 1642372813 is about 40526.1990939195. The cubic root of 1642372813 is about 1179.8421729447.

The spelling of 1642372813 in words is "one billion, six hundred forty-two million, three hundred seventy-two thousand, eight hundred thirteen".