117909951 has 4 divisors (see below), whose sum is σ = 157213272. Its totient is φ = 78606632.

The previous prime is 117909941. The next prime is 117910007. The reversal of 117909951 is 159909711.

It is a happy number.

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 117909951 - 2⁷ = 117909823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117909901) 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, 19651656 + ... + 19651661.

It is an arithmetic number, because the mean of its divisors is an integer number (39303318).

Almost surely, 2^117909951 is an apocalyptic number.

117909951 is a deficient number, since it is larger than the sum of its proper divisors (39303321).

117909951 is an equidigital number, since it uses as much as digits as its factorization.

117909951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39303320.

The product of its (nonzero) digits is 25515, while the sum is 42.

The square root of 117909951 is about 10858.6348589498. The cubic root of 117909951 is about 490.3620134715.

The spelling of 117909951 in words is "one hundred seventeen million, nine hundred nine thousand, nine hundred fifty-one".