1217172503 has 2 divisors, whose sum is σ = 1217172504. Its totient is φ = 1217172502.

The previous prime is 1217172479. The next prime is 1217172557. The reversal of 1217172503 is 3052717121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1217172503 - 2²⁶ = 1150063639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217172563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608586251 + 608586252.

It is an arithmetic number, because the mean of its divisors is an integer number (608586252).

Almost surely, 2^1217172503 is an apocalyptic number.

1217172503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217172503 is an equidigital number, since it uses as much as digits as its factorization.

1217172503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 1217172503 is about 34887.9994124054. Note that the first 3 decimals coincide. The cubic root of 1217172503 is about 1067.7036094755.

Adding to 1217172503 its reverse (3052717121), we get a palindrome (4269889624).

The spelling of 1217172503 in words is "one billion, two hundred seventeen million, one hundred seventy-two thousand, five hundred three".