195373993 has 2 divisors, whose sum is σ = 195373994. Its totient is φ = 195373992.

The previous prime is 195373991. The next prime is 195373999. The reversal of 195373993 is 399373591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148547344 + 46826649 = 12188^2 + 6843^2 .

It is an emirp because it is prime and its reverse (399373591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195373993 - 2¹ = 195373991 is a prime.

Together with 195373991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (195373991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97686996 + 97686997.

It is an arithmetic number, because the mean of its divisors is an integer number (97686997).

Almost surely, 2^195373993 is an apocalyptic number.

It is an amenable number.

195373993 is a deficient number, since it is larger than the sum of its proper divisors (1).

195373993 is an equidigital number, since it uses as much as digits as its factorization.

195373993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 688905, while the sum is 49.

The square root of 195373993 is about 13977.6247266837. The cubic root of 195373993 is about 580.2594885264.

The spelling of 195373993 in words is "one hundred ninety-five million, three hundred seventy-three thousand, nine hundred ninety-three".