117427861 has 2 divisors, whose sum is σ = 117427862. Its totient is φ = 117427860.

The previous prime is 117427853. The next prime is 117427927. The reversal of 117427861 is 168724711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92736900 + 24690961 = 9630^2 + 4969^2 .

It is a cyclic number.

It is not a de Polignac number, because 117427861 - 2³ = 117427853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117427861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117427831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58713930 + 58713931.

It is an arithmetic number, because the mean of its divisors is an integer number (58713931).

Almost surely, 2^117427861 is an apocalyptic number.

It is an amenable number.

117427861 is a deficient number, since it is larger than the sum of its proper divisors (1).

117427861 is an equidigital number, since it uses as much as digits as its factorization.

117427861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 37.

The square root of 117427861 is about 10836.4136595093. The cubic root of 117427861 is about 489.6927978626.

The spelling of 117427861 in words is "one hundred seventeen million, four hundred twenty-seven thousand, eight hundred sixty-one".