39191490193 has 2 divisors, whose sum is σ = 39191490194. Its totient is φ = 39191490192.

The previous prime is 39191490181. The next prime is 39191490203. The reversal of 39191490193 is 39109419193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32678515984 + 6512974209 = 180772^2 + 80703^2 .

It is a cyclic number.

It is not a de Polignac number, because 39191490193 - 2²¹ = 39189393041 is a prime.

It is not a weakly prime, because it can be changed into another prime (39191490103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19595745096 + 19595745097.

It is an arithmetic number, because the mean of its divisors is an integer number (19595745097).

Almost surely, 2^39191490193 is an apocalyptic number.

It is an amenable number.

39191490193 is a deficient number, since it is larger than the sum of its proper divisors (1).

39191490193 is an equidigital number, since it uses as much as digits as its factorization.

39191490193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 49.

The spelling of 39191490193 in words is "thirty-nine billion, one hundred ninety-one million, four hundred ninety thousand, one hundred ninety-three".