991219349 has 2 divisors, whose sum is σ = 991219350. Its totient is φ = 991219348.

The previous prime is 991219337. The next prime is 991219363. The reversal of 991219349 is 943912199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 927507025 + 63712324 = 30455^2 + 7982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991219349 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991215349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495609674 + 495609675.

It is an arithmetic number, because the mean of its divisors is an integer number (495609675).

Almost surely, 2^991219349 is an apocalyptic number.

It is an amenable number.

991219349 is a deficient number, since it is larger than the sum of its proper divisors (1).

991219349 is an equidigital number, since it uses as much as digits as its factorization.

991219349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 47.

The square root of 991219349 is about 31483.6362099425. The cubic root of 991219349 is about 997.0645076498.

The spelling of 991219349 in words is "nine hundred ninety-one million, two hundred nineteen thousand, three hundred forty-nine".