1918281917 has 2 divisors, whose sum is σ = 1918281918. Its totient is φ = 1918281916.

The previous prime is 1918281907. The next prime is 1918281919. The reversal of 1918281917 is 7191828191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1704946681 + 213335236 = 41291^2 + 14606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918281917 - 2⁸ = 1918281661 is a prime.

Together with 1918281919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918281919) 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, 959140958 + 959140959.

It is an arithmetic number, because the mean of its divisors is an integer number (959140959).

Almost surely, 2^1918281917 is an apocalyptic number.

It is an amenable number.

1918281917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918281917 is an equidigital number, since it uses as much as digits as its factorization.

1918281917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 47.

The square root of 1918281917 is about 43798.1953623662. The cubic root of 1918281917 is about 1242.5221637363.

The spelling of 1918281917 in words is "one billion, nine hundred eighteen million, two hundred eighty-one thousand, nine hundred seventeen".