1990332109 has 2 divisors, whose sum is σ = 1990332110. Its totient is φ = 1990332108.

The previous prime is 1990332101. The next prime is 1990332119. The reversal of 1990332109 is 9012330991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1747658025 + 242674084 = 41805^2 + 15578^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990332109 - 2³ = 1990332101 is a prime.

It is a super-2 number, since 2×1990332109² = 7922843808232775762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990332101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995166054 + 995166055.

It is an arithmetic number, because the mean of its divisors is an integer number (995166055).

Almost surely, 2^1990332109 is an apocalyptic number.

It is an amenable number.

1990332109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990332109 is an equidigital number, since it uses as much as digits as its factorization.

1990332109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 1990332109 is about 44613.1383002810. The cubic root of 1990332109 is about 1257.8876400060.

The spelling of 1990332109 in words is "one billion, nine hundred ninety million, three hundred thirty-two thousand, one hundred nine".