117891145 has 16 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 92120704.

The previous prime is 117891089. The next prime is 117891149. The reversal of 117891145 is 541198711.

117891145 = T₆ + T₇ + ... + T₈₉₀.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 117891145 - 2¹³ = 117882953 is a prime.

It is a super-2 number, since 2×117891145² = 27796644138822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117891149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48069 + ... + 50461.

It is an arithmetic number, because the mean of its divisors is an integer number (9049320).

Almost surely, 2^117891145 is an apocalyptic number.

It is an amenable number.

117891145 is a deficient number, since it is larger than the sum of its proper divisors (26897975).

117891145 is a wasteful number, since it uses less digits than its factorization.

117891145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624.

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

The square root of 117891145 is about 10857.7688776286. The cubic root of 117891145 is about 490.3359420550.

The spelling of 117891145 in words is "one hundred seventeen million, eight hundred ninety-one thousand, one hundred forty-five".