1188006817 has 2 divisors, whose sum is σ = 1188006818. Its totient is φ = 1188006816.

The previous prime is 1188006797. The next prime is 1188006829. The reversal of 1188006817 is 7186008811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 977437696 + 210569121 = 31264^2 + 14511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1188006817 is a prime.

It is a super-2 number, since 2×1188006817² = 2822720394476942978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1188006817.

It is not a weakly prime, because it can be changed into another prime (1188006877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594003408 + 594003409.

It is an arithmetic number, because the mean of its divisors is an integer number (594003409).

Almost surely, 2^1188006817 is an apocalyptic number.

It is an amenable number.

1188006817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188006817 is an equidigital number, since it uses as much as digits as its factorization.

1188006817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 40.

The square root of 1188006817 is about 34467.4747697014. The cubic root of 1188006817 is about 1059.1065263839.

The spelling of 1188006817 in words is "one billion, one hundred eighty-eight million, six thousand, eight hundred seventeen".