1994913769 has 2 divisors, whose sum is σ = 1994913770. Its totient is φ = 1994913768.

The previous prime is 1994913751. The next prime is 1994913779. The reversal of 1994913769 is 9673194991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1569110544 + 425803225 = 39612^2 + 20635^2 .

It is an emirp because it is prime and its reverse (9673194991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1994913769 - 2²³ = 1986525161 is a prime.

It is a super-2 number, since 2×1994913769² = 7959361891491570722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1994913779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997456884 + 997456885.

It is an arithmetic number, because the mean of its divisors is an integer number (997456885).

Almost surely, 2^1994913769 is an apocalyptic number.

It is an amenable number.

1994913769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994913769 is an equidigital number, since it uses as much as digits as its factorization.

1994913769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 58.

The square root of 1994913769 is about 44664.4575585554. The cubic root of 1994913769 is about 1258.8521016456.

The spelling of 1994913769 in words is "one billion, nine hundred ninety-four million, nine hundred thirteen thousand, seven hundred sixty-nine".