1994337979237 has 2 divisors, whose sum is σ = 1994337979238. Its totient is φ = 1994337979236.

The previous prime is 1994337979171. The next prime is 1994337979273. The reversal of 1994337979237 is 7329797334991.

Together with next prime (1994337979273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1991841078276 + 2496900961 = 1411326^2 + 49969^2 .

It is an emirp because it is prime and its reverse (7329797334991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1994337979237 - 2²³ = 1994329590629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1994337979237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994337979037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997168989618 + 997168989619.

It is an arithmetic number, because the mean of its divisors is an integer number (997168989619).

Almost surely, 2^{1994337979237} is an apocalyptic number.

It is an amenable number.

1994337979237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994337979237 is an equidigital number, since it uses as much as digits as its factorization.

1994337979237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486091368, while the sum is 73.

The spelling of 1994337979237 in words is "one trillion, nine hundred ninety-four billion, three hundred thirty-seven million, nine hundred seventy-nine thousand, two hundred thirty-seven".