117951481 has 4 divisors (see below), whose sum is σ = 118089972. Its totient is φ = 117812992.

The previous prime is 117951473. The next prime is 117951499. The reversal of 117951481 is 184159711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184159711 = 173 ⋅1064507.

It can be written as a sum of positive squares in 2 ways, for example, as 109914256 + 8037225 = 10484^2 + 2835^2 .

It is a cyclic number.

It is not a de Polignac number, because 117951481 - 2³ = 117951473 is a prime.

It is a super-2 number, since 2×117951481² = 27825103740186722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117951481.

It is not an unprimeable number, because it can be changed into a prime (117951401) 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 in 3 ways as a sum of consecutive naturals, for example, 67960 + ... + 69673.

It is an arithmetic number, because the mean of its divisors is an integer number (29522493).

Almost surely, 2^117951481 is an apocalyptic number.

It is an amenable number.

117951481 is a deficient number, since it is larger than the sum of its proper divisors (138491).

117951481 is an equidigital number, since it uses as much as digits as its factorization.

117951481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138490.

The product of its digits is 10080, while the sum is 37.

The square root of 117951481 is about 10860.5469935911. The cubic root of 117951481 is about 490.4195781463.

The spelling of 117951481 in words is "one hundred seventeen million, nine hundred fifty-one thousand, four hundred eighty-one".