117481531 has 4 divisors (see below), whose sum is σ = 117536832. Its totient is φ = 117426232.

The previous prime is 117481519. The next prime is 117481561. The reversal of 117481531 is 135184711.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117481531 is a prime.

It is a super-2 number, since 2×117481531² = 27603820252207922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117481493 and 117481502.

It is not an unprimeable number, because it can be changed into a prime (117481561) 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, 24331 + ... + 28756.

It is an arithmetic number, because the mean of its divisors is an integer number (29384208).

Almost surely, 2^117481531 is an apocalyptic number.

117481531 is a deficient number, since it is larger than the sum of its proper divisors (55301).

117481531 is an equidigital number, since it uses as much as digits as its factorization.

117481531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55300.

The product of its digits is 3360, while the sum is 31.

The square root of 117481531 is about 10838.8897494162. The cubic root of 117481531 is about 489.7673906360.

The spelling of 117481531 in words is "one hundred seventeen million, four hundred eighty-one thousand, five hundred thirty-one".