193021139 has 2 divisors, whose sum is σ = 193021140. Its totient is φ = 193021138.

The previous prime is 193021121. The next prime is 193021163. The reversal of 193021139 is 931120391.

It is a weak prime.

It is an emirp because it is prime and its reverse (931120391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 193021139 - 2¹⁶ = 192955603 is a prime.

It is equal to p_10713692 and since 193021139 and 10713692 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (193021189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96510569 + 96510570.

It is an arithmetic number, because the mean of its divisors is an integer number (96510570).

Almost surely, 2^193021139 is an apocalyptic number.

193021139 is a deficient number, since it is larger than the sum of its proper divisors (1).

193021139 is an equidigital number, since it uses as much as digits as its factorization.

193021139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 193021139 is about 13893.2047778761. The cubic root of 193021139 is about 577.9207545720.

The spelling of 193021139 in words is "one hundred ninety-three million, twenty-one thousand, one hundred thirty-nine".