190638653 has 2 divisors, whose sum is σ = 190638654. Its totient is φ = 190638652.

The previous prime is 190638649. The next prime is 190638703. The reversal of 190638653 is 356836091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174292804 + 16345849 = 13202^2 + 4043^2 .

It is a cyclic number.

It is not a de Polignac number, because 190638653 - 2² = 190638649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 190638653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190638353) 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, 95319326 + 95319327.

It is an arithmetic number, because the mean of its divisors is an integer number (95319327).

Almost surely, 2^190638653 is an apocalyptic number.

It is an amenable number.

190638653 is a deficient number, since it is larger than the sum of its proper divisors (1).

190638653 is an equidigital number, since it uses as much as digits as its factorization.

190638653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 190638653 is about 13807.1956964476. The cubic root of 190638653 is about 575.5331191690.

The spelling of 190638653 in words is "one hundred ninety million, six hundred thirty-eight thousand, six hundred fifty-three".