9919694549 has 2 divisors, whose sum is σ = 9919694550. Its totient is φ = 9919694548.

The previous prime is 9919694539. The next prime is 9919694573. The reversal of 9919694549 is 9454969199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9766380625 + 153313924 = 98825^2 + 12382^2 .

It is a cyclic number.

It is not a de Polignac number, because 9919694549 - 2¹² = 9919690453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9919694509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959847274 + 4959847275.

It is an arithmetic number, because the mean of its divisors is an integer number (4959847275).

Almost surely, 2^9919694549 is an apocalyptic number.

It is an amenable number.

9919694549 is a deficient number, since it is larger than the sum of its proper divisors (1).

9919694549 is an equidigital number, since it uses as much as digits as its factorization.

9919694549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28343520, while the sum is 65.

The square root of 9919694549 is about 99597.6633711856. The cubic root of 9919694549 is about 2148.6520881674.

The spelling of 9919694549 in words is "nine billion, nine hundred nineteen million, six hundred ninety-four thousand, five hundred forty-nine".