117451661 has 2 divisors, whose sum is σ = 117451662. Its totient is φ = 117451660.

The previous prime is 117451613. The next prime is 117451669. The reversal of 117451661 is 166154711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86304100 + 31147561 = 9290^2 + 5581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117451661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117451669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58725830 + 58725831.

It is an arithmetic number, because the mean of its divisors is an integer number (58725831).

Almost surely, 2^117451661 is an apocalyptic number.

It is an amenable number.

117451661 is a deficient number, since it is larger than the sum of its proper divisors (1).

117451661 is an equidigital number, since it uses as much as digits as its factorization.

117451661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 117451661 is about 10837.5117531655. The cubic root of 117451661 is about 489.7258788856.

The spelling of 117451661 in words is "one hundred seventeen million, four hundred fifty-one thousand, six hundred sixty-one".