117681947 has 4 divisors (see below), whose sum is σ = 117848640. Its totient is φ = 117515256.

The previous prime is 117681923. The next prime is 117681989. The reversal of 117681947 is 749186711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 117681947 - 2⁸ = 117681691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117681898 and 117681907.

It is not an unprimeable number, because it can be changed into a prime (117681647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82283 + ... + 83700.

It is an arithmetic number, because the mean of its divisors is an integer number (29462160).

Almost surely, 2^117681947 is an apocalyptic number.

117681947 is a deficient number, since it is larger than the sum of its proper divisors (166693).

117681947 is an equidigital number, since it uses as much as digits as its factorization.

117681947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166692.

The product of its digits is 84672, while the sum is 44.

The square root of 117681947 is about 10848.1310371879. The cubic root of 117681947 is about 490.0457363945.

The spelling of 117681947 in words is "one hundred seventeen million, six hundred eighty-one thousand, nine hundred forty-seven".