193978451 has 2 divisors, whose sum is σ = 193978452. Its totient is φ = 193978450.

The previous prime is 193978423. The next prime is 193978453. The reversal of 193978451 is 154879391.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193978451 is a prime.

Together with 193978453, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 193978396 and 193978405.

It is not a weakly prime, because it can be changed into another prime (193978453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96989225 + 96989226.

It is an arithmetic number, because the mean of its divisors is an integer number (96989226).

Almost surely, 2^193978451 is an apocalyptic number.

193978451 is a deficient number, since it is larger than the sum of its proper divisors (1).

193978451 is an equidigital number, since it uses as much as digits as its factorization.

193978451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 193978451 is about 13927.6146916836. The cubic root of 193978451 is about 578.8746023392.

The spelling of 193978451 in words is "one hundred ninety-three million, nine hundred seventy-eight thousand, four hundred fifty-one".