9919794213 has 12 divisors (see below), whose sum is σ = 16375533408. Its totient is φ = 5668453800.

The previous prime is 9919794211. The next prime is 9919794251. The reversal of 9919794213 is 3124979199.

It is a happy number.

It is not a de Polignac number, because 9919794213 - 2¹ = 9919794211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9919794213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919794211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78728463 + ... + 78728588.

It is an arithmetic number, because the mean of its divisors is an integer number (1364627784).

Almost surely, 2^9919794213 is an apocalyptic number.

It is an amenable number.

9919794213 is a deficient number, since it is larger than the sum of its proper divisors (6455739195).

9919794213 is a wasteful number, since it uses less digits than its factorization.

9919794213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157457064 (or 157457061 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 9919794213 is about 99598.1637029519. The cubic root of 9919794213 is about 2148.6592840390.

The spelling of 9919794213 in words is "nine billion, nine hundred nineteen million, seven hundred ninety-four thousand, two hundred thirteen".