1228620919 has 2 divisors, whose sum is σ = 1228620920. Its totient is φ = 1228620918.

The previous prime is 1228620917. The next prime is 1228620961. The reversal of 1228620919 is 9190268221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1228620919 - 2¹ = 1228620917 is a prime.

It is a super-2 number, since 2×1228620919² = 3019018725208809122, which contains 22 as substring.

Together with 1228620917, 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 (1228620917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614310459 + 614310460.

It is an arithmetic number, because the mean of its divisors is an integer number (614310460).

Almost surely, 2^1228620919 is an apocalyptic number.

1228620919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228620919 is an equidigital number, since it uses as much as digits as its factorization.

1228620919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1228620919 is about 35051.6892460264. The cubic root of 1228620919 is about 1071.0406851721.

The spelling of 1228620919 in words is "one billion, two hundred twenty-eight million, six hundred twenty thousand, nine hundred nineteen".