1990185097 has 2 divisors, whose sum is σ = 1990185098. Its totient is φ = 1990185096.

The previous prime is 1990185083. The next prime is 1990185137. The reversal of 1990185097 is 7905810991.

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., 1460080521 + 530104576 = 38211^2 + 23024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990185097 - 2⁷ = 1990184969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1990185097.

It is not a weakly prime, because it can be changed into another prime (1990185017) 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, 995092548 + 995092549.

It is an arithmetic number, because the mean of its divisors is an integer number (995092549).

Almost surely, 2^1990185097 is an apocalyptic number.

It is an amenable number.

1990185097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990185097 is an equidigital number, since it uses as much as digits as its factorization.

1990185097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 1990185097 is about 44611.4906386236. The cubic root of 1990185097 is about 1257.8566687709.

The spelling of 1990185097 in words is "one billion, nine hundred ninety million, one hundred eighty-five thousand, ninety-seven".