117245861 has 2 divisors, whose sum is σ = 117245862. Its totient is φ = 117245860.

The previous prime is 117245839. The next prime is 117245879. The reversal of 117245861 is 168542711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98704225 + 18541636 = 9935^2 + 4306^2 .

It is a cyclic number.

It is not a de Polignac number, because 117245861 - 2⁶ = 117245797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117245801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58622930 + 58622931.

It is an arithmetic number, because the mean of its divisors is an integer number (58622931).

Almost surely, 2^117245861 is an apocalyptic number.

It is an amenable number.

117245861 is a deficient number, since it is larger than the sum of its proper divisors (1).

117245861 is an equidigital number, since it uses as much as digits as its factorization.

117245861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 35.

The square root of 117245861 is about 10828.0127909049. The cubic root of 117245861 is about 489.4396774298.

The spelling of 117245861 in words is "one hundred seventeen million, two hundred forty-five thousand, eight hundred sixty-one".