1217428619 has 4 divisors (see below), whose sum is σ = 1328103960. Its totient is φ = 1106753280.

The previous prime is 1217428609. The next prime is 1217428627. The reversal of 1217428619 is 9168247121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1217428619 - 2²⁰ = 1216380043 is a prime.

It is a super-2 number, since 2×1217428619² = 2964264884720494322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217428609) 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 3 ways as a sum of consecutive naturals, for example, 55337654 + ... + 55337675.

It is an arithmetic number, because the mean of its divisors is an integer number (332025990).

Almost surely, 2^1217428619 is an apocalyptic number.

1217428619 is a deficient number, since it is larger than the sum of its proper divisors (110675341).

1217428619 is a wasteful number, since it uses less digits than its factorization.

1217428619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110675340.

The product of its digits is 48384, while the sum is 41.

The square root of 1217428619 is about 34891.6697651459. The cubic root of 1217428619 is about 1067.7784925342.

The spelling of 1217428619 in words is "one billion, two hundred seventeen million, four hundred twenty-eight thousand, six hundred nineteen".