117673981 has 2 divisors, whose sum is σ = 117673982. Its totient is φ = 117673980.

The previous prime is 117673979. The next prime is 117673987. The reversal of 117673981 is 189376711.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59151481 + 58522500 = 7691^2 + 7650^2 .

It is a cyclic number.

It is not a de Polignac number, because 117673981 - 2¹ = 117673979 is a prime.

It is a super-2 number, since 2×117673981² = 27694331608776722, which contains 22 as substring.

Together with 117673979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117673987) 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, 58836990 + 58836991.

It is an arithmetic number, because the mean of its divisors is an integer number (58836991).

Almost surely, 2^117673981 is an apocalyptic number.

It is an amenable number.

117673981 is a deficient number, since it is larger than the sum of its proper divisors (1).

117673981 is an equidigital number, since it uses as much as digits as its factorization.

117673981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 117673981 is about 10847.7638709552. The cubic root of 117673981 is about 490.0346789284.

It can be divided in two parts, 1176 and 73981, that added together give a palindrome (75157).

The spelling of 117673981 in words is "one hundred seventeen million, six hundred seventy-three thousand, nine hundred eighty-one".