1217372245 has 16 divisors (see below), whose sum is σ = 1484271360. Its totient is φ = 958313664.

The previous prime is 1217372209. The next prime is 1217372251. The reversal of 1217372245 is 5422737121.

It is a cyclic number.

It is not a de Polignac number, because 1217372245 - 2⁹ = 1217371733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1217372245.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 477444 + ... + 479986.

It is an arithmetic number, because the mean of its divisors is an integer number (92766960).

Almost surely, 2^1217372245 is an apocalyptic number.

It is an amenable number.

1217372245 is a deficient number, since it is larger than the sum of its proper divisors (266899115).

1217372245 is a wasteful number, since it uses less digits than its factorization.

1217372245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044.

The product of its digits is 23520, while the sum is 34.

The square root of 1217372245 is about 34890.8619125409. The cubic root of 1217372245 is about 1067.7620108358.

The spelling of 1217372245 in words is "one billion, two hundred seventeen million, three hundred seventy-two thousand, two hundred forty-five".