117541991 has 8 divisors (see below), whose sum is σ = 136226304. Its totient is φ = 99330840.

The previous prime is 117541979. The next prime is 117541993. The reversal of 117541991 is 199145711.

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

It is not a de Polignac number, because 117541991 - 2¹⁸ = 117279847 is a prime.

It is a super-2 number, since 2×117541991² = 27632239296488162, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117541993) 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, 117755 + ... + 118748.

It is an arithmetic number, because the mean of its divisors is an integer number (17028288).

Almost surely, 2^117541991 is an apocalyptic number.

117541991 is a deficient number, since it is larger than the sum of its proper divisors (18684313).

117541991 is an equidigital number, since it uses as much as digits as its factorization.

117541991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236581.

The product of its digits is 11340, while the sum is 38.

The square root of 117541991 is about 10841.6784217205. The cubic root of 117541991 is about 489.8513932248.

The spelling of 117541991 in words is "one hundred seventeen million, five hundred forty-one thousand, nine hundred ninety-one".