195001081993 has 2 divisors, whose sum is σ = 195001081994. Its totient is φ = 195001081992.

The previous prime is 195001081987. The next prime is 195001082039. The reversal of 195001081993 is 399180100591.

It is an a-pointer prime, because the next prime (195001082039) can be obtained adding 195001081993 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175132206144 + 19868875849 = 418488^2 + 140957^2 .

It is a cyclic number.

It is not a de Polignac number, because 195001081993 - 2⁹ = 195001081481 is a prime.

It is not a weakly prime, because it can be changed into another prime (195001081193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97500540996 + 97500540997.

It is an arithmetic number, because the mean of its divisors is an integer number (97500540997).

Almost surely, 2^195001081993 is an apocalyptic number.

It is an amenable number.

195001081993 is a deficient number, since it is larger than the sum of its proper divisors (1).

195001081993 is an equidigital number, since it uses as much as digits as its factorization.

195001081993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 46.

The spelling of 195001081993 in words is "one hundred ninety-five billion, one million, eighty-one thousand, nine hundred ninety-three".