117287531 has 8 divisors (see below), whose sum is σ = 120504384. Its totient is φ = 114093000.

The previous prime is 117287507. The next prime is 117287537. The reversal of 117287531 is 135782711.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117287531 is a prime.

It is a super-2 number, since 2×117287531² = 27512729856151922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117287491 and 117287500.

It is not an unprimeable number, because it can be changed into a prime (117287537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5360 + ... + 16226.

It is an arithmetic number, because the mean of its divisors is an integer number (15063048).

Almost surely, 2^117287531 is an apocalyptic number.

117287531 is a deficient number, since it is larger than the sum of its proper divisors (3216853).

117287531 is a wasteful number, since it uses less digits than its factorization.

117287531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11161.

The product of its digits is 11760, while the sum is 35.

The square root of 117287531 is about 10829.9367957528. The cubic root of 117287531 is about 489.4976539915.

The spelling of 117287531 in words is "one hundred seventeen million, two hundred eighty-seven thousand, five hundred thirty-one".