919489720309 has 2 divisors, whose sum is σ = 919489720310. Its totient is φ = 919489720308.

The previous prime is 919489720307. The next prime is 919489720339. The reversal of 919489720309 is 903027984919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 669336696900 + 250153023409 = 818130^2 + 500153^2 .

It is a cyclic number.

It is not a de Polignac number, because 919489720309 - 2¹ = 919489720307 is a prime.

It is a super-2 number, since 2×919489720309² (a number of 25 digits) contains 22 as substring.

Together with 919489720307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919489720307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459744860154 + 459744860155.

It is an arithmetic number, because the mean of its divisors is an integer number (459744860155).

Almost surely, 2^919489720309 is an apocalyptic number.

It is an amenable number.

919489720309 is a deficient number, since it is larger than the sum of its proper divisors (1).

919489720309 is an equidigital number, since it uses as much as digits as its factorization.

919489720309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 61.

The spelling of 919489720309 in words is "nine hundred nineteen billion, four hundred eighty-nine million, seven hundred twenty thousand, three hundred nine".