1217972207 has 2 divisors, whose sum is σ = 1217972208. Its totient is φ = 1217972206.

The previous prime is 1217972201. The next prime is 1217972263. The reversal of 1217972207 is 7022797121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217972207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217972201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608986103 + 608986104.

It is an arithmetic number, because the mean of its divisors is an integer number (608986104).

Almost surely, 2^1217972207 is an apocalyptic number.

1217972207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217972207 is an equidigital number, since it uses as much as digits as its factorization.

1217972207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24696, while the sum is 38.

The square root of 1217972207 is about 34899.4585488085. The cubic root of 1217972207 is about 1067.9373917088.

The spelling of 1217972207 in words is "one billion, two hundred seventeen million, nine hundred seventy-two thousand, two hundred seven".