1217145983 has 2 divisors, whose sum is σ = 1217145984. Its totient is φ = 1217145982.

The previous prime is 1217145961. The next prime is 1217146001. The reversal of 1217145983 is 3895417121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217145983 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1217145983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217145913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608572991 + 608572992.

It is an arithmetic number, because the mean of its divisors is an integer number (608572992).

Almost surely, 2^1217145983 is an apocalyptic number.

1217145983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217145983 is an equidigital number, since it uses as much as digits as its factorization.

1217145983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 1217145983 is about 34887.6193369510. The cubic root of 1217145983 is about 1067.6958549720.

The spelling of 1217145983 in words is "one billion, two hundred seventeen million, one hundred forty-five thousand, nine hundred eighty-three".