1217097919 has 2 divisors, whose sum is σ = 1217097920. Its totient is φ = 1217097918.

The previous prime is 1217097911. The next prime is 1217097941. The reversal of 1217097919 is 9197907121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1217097919 - 2³ = 1217097911 is a prime.

It is a super-2 number, since 2×1217097919² = 2962654688868261122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217097911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608548959 + 608548960.

It is an arithmetic number, because the mean of its divisors is an integer number (608548960).

Almost surely, 2^1217097919 is an apocalyptic number.

1217097919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217097919 is an equidigital number, since it uses as much as digits as its factorization.

1217097919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 46.

The square root of 1217097919 is about 34886.9304897980. The cubic root of 1217097919 is about 1067.6818006707.

The spelling of 1217097919 in words is "one billion, two hundred seventeen million, ninety-seven thousand, nine hundred nineteen".