193129421 has 2 divisors, whose sum is σ = 193129422. Its totient is φ = 193129420.

The previous prime is 193129379. The next prime is 193129427. The reversal of 193129421 is 124921391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190136521 + 2992900 = 13789^2 + 1730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193129421 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 (193129427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96564710 + 96564711.

It is an arithmetic number, because the mean of its divisors is an integer number (96564711).

Almost surely, 2^193129421 is an apocalyptic number.

It is an amenable number.

193129421 is a deficient number, since it is larger than the sum of its proper divisors (1).

193129421 is an equidigital number, since it uses as much as digits as its factorization.

193129421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 193129421 is about 13897.1011725467. The cubic root of 193129421 is about 578.0288026978.

The spelling of 193129421 in words is "one hundred ninety-three million, one hundred twenty-nine thousand, four hundred twenty-one".