1217105551 has 2 divisors, whose sum is σ = 1217105552. Its totient is φ = 1217105550.

The previous prime is 1217105507. The next prime is 1217105563. The reversal of 1217105551 is 1555017121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1217105551 - 2⁷ = 1217105423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217105051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608552775 + 608552776.

It is an arithmetic number, because the mean of its divisors is an integer number (608552776).

Almost surely, 2^1217105551 is an apocalyptic number.

1217105551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217105551 is an equidigital number, since it uses as much as digits as its factorization.

1217105551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1750, while the sum is 28.

The square root of 1217105551 is about 34887.0398715626. The cubic root of 1217105551 is about 1067.6840323538.

The spelling of 1217105551 in words is "one billion, two hundred seventeen million, one hundred five thousand, five hundred fifty-one".