194644380731 has 2 divisors, whose sum is σ = 194644380732. Its totient is φ = 194644380730.

The previous prime is 194644380709. The next prime is 194644380781. The reversal of 194644380731 is 137083446491.

It is an a-pointer prime, because the next prime (194644380781) can be obtained adding 194644380731 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194644380731 is a prime.

It is a super-2 number, since 2×194644380731² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 194644380731.

It is not a weakly prime, because it can be changed into another prime (194644380781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97322190365 + 97322190366.

It is an arithmetic number, because the mean of its divisors is an integer number (97322190366).

Almost surely, 2^194644380731 is an apocalyptic number.

194644380731 is a deficient number, since it is larger than the sum of its proper divisors (1).

194644380731 is an equidigital number, since it uses as much as digits as its factorization.

194644380731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 194644380731 in words is "one hundred ninety-four billion, six hundred forty-four million, three hundred eighty thousand, seven hundred thirty-one".