9991769 has 2 divisors, whose sum is σ = 9991770. Its totient is φ = 9991768.

The previous prime is 9991757. The next prime is 9991771. The reversal of 9991769 is 9671999.

9991769 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8340544 + 1651225 = 2888^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991769 - 2¹⁶ = 9926233 is a prime.

It is a super-2 number, since 2×9991769² = 199670895498722, which contains 22 as substring.

Together with 9991771, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9991469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995884 + 4995885.

It is an arithmetic number, because the mean of its divisors is an integer number (4995885).

Almost surely, 2^9991769 is an apocalyptic number.

It is an amenable number.

9991769 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991769 is an equidigital number, since it uses as much as digits as its factorization.

9991769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 50.

The square root of 9991769 is about 3160.9759568842. The cubic root of 9991769 is about 215.3843422714.

The spelling of 9991769 in words is "nine million, nine hundred ninety-one thousand, seven hundred sixty-nine".