1990405201 has 2 divisors, whose sum is σ = 1990405202. Its totient is φ = 1990405200.

The previous prime is 1990405181. The next prime is 1990405213. The reversal of 1990405201 is 1025040991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1169640000 + 820765201 = 34200^2 + 28649^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990405201 - 2¹¹ = 1990403153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1990400201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995202600 + 995202601.

It is an arithmetic number, because the mean of its divisors is an integer number (995202601).

Almost surely, 2^1990405201 is an apocalyptic number.

It is an amenable number.

1990405201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990405201 is an equidigital number, since it uses as much as digits as its factorization.

1990405201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 1990405201 is about 44613.9574684874. The cubic root of 1990405201 is about 1257.9030378380.

The spelling of 1990405201 in words is "one billion, nine hundred ninety million, four hundred five thousand, two hundred one".