1990471073 has 2 divisors, whose sum is σ = 1990471074. Its totient is φ = 1990471072.

The previous prime is 1990471039. The next prime is 1990471079. The reversal of 1990471073 is 3701740991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1537973089 + 452497984 = 39217^2 + 21272^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990471073 - 2²⁰ = 1989422497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1990471073.

It is not a weakly prime, because it can be changed into another prime (1990471079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995235536 + 995235537.

It is an arithmetic number, because the mean of its divisors is an integer number (995235537).

Almost surely, 2^1990471073 is an apocalyptic number.

It is an amenable number.

1990471073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990471073 is an equidigital number, since it uses as much as digits as its factorization.

1990471073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 1990471073 is about 44614.6957066839. The cubic root of 1990471073 is about 1257.9169143550.

The spelling of 1990471073 in words is "one billion, nine hundred ninety million, four hundred seventy-one thousand, seventy-three".