193442791 has 2 divisors, whose sum is σ = 193442792. Its totient is φ = 193442790.

The previous prime is 193442729. The next prime is 193442807. The reversal of 193442791 is 197244391.

It is a strong prime.

It is an emirp because it is prime and its reverse (197244391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193442791 is a prime.

It is a super-4 number, since 4×193442791⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193472791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96721395 + 96721396.

It is an arithmetic number, because the mean of its divisors is an integer number (96721396).

Almost surely, 2^193442791 is an apocalyptic number.

193442791 is a deficient number, since it is larger than the sum of its proper divisors (1).

193442791 is an equidigital number, since it uses as much as digits as its factorization.

193442791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 193442791 is about 13908.3712561896. The cubic root of 193442791 is about 578.3412684748.

The spelling of 193442791 in words is "one hundred ninety-three million, four hundred forty-two thousand, seven hundred ninety-one".