1217236939 has 2 divisors, whose sum is σ = 1217236940. Its totient is φ = 1217236938.

The previous prime is 1217236921. The next prime is 1217236949. The reversal of 1217236939 is 9396327121.

It is a strong prime.

It is an emirp because it is prime and its reverse (9396327121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1217236939 - 2²⁷ = 1083019211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1217236895 and 1217236904.

It is not a weakly prime, because it can be changed into another prime (1217236949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608618469 + 608618470.

It is an arithmetic number, because the mean of its divisors is an integer number (608618470).

Almost surely, 2^1217236939 is an apocalyptic number.

1217236939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217236939 is an equidigital number, since it uses as much as digits as its factorization.

1217236939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 43.

The square root of 1217236939 is about 34888.9228695871. The cubic root of 1217236939 is about 1067.7224502275.

The spelling of 1217236939 in words is "one billion, two hundred seventeen million, two hundred thirty-six thousand, nine hundred thirty-nine".