193016821 has 2 divisors, whose sum is σ = 193016822. Its totient is φ = 193016820.

The previous prime is 193016737. The next prime is 193016833. The reversal of 193016821 is 128610391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190164100 + 2852721 = 13790^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 193016821 - 2²⁵ = 159462389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193316821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96508410 + 96508411.

It is an arithmetic number, because the mean of its divisors is an integer number (96508411).

Almost surely, 2^193016821 is an apocalyptic number.

It is an amenable number.

193016821 is a deficient number, since it is larger than the sum of its proper divisors (1).

193016821 is an equidigital number, since it uses as much as digits as its factorization.

193016821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 193016821 is about 13893.0493772965. The cubic root of 193016821 is about 577.9164450605.

The spelling of 193016821 in words is "one hundred ninety-three million, sixteen thousand, eight hundred twenty-one".