116671781 has 4 divisors (see below), whose sum is σ = 117276492. Its totient is φ = 116067072.

The previous prime is 116671757. The next prime is 116671783. The reversal of 116671781 is 187176611.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11937025 + 104734756 = 3455^2 + 10234^2 .

It is a cyclic number.

It is not a de Polignac number, because 116671781 - 2²⁶ = 49562917 is a prime.

It is a super-2 number, since 2×116671781² = 27224608963423922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116671783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302066 + ... + 302451.

It is an arithmetic number, because the mean of its divisors is an integer number (29319123).

Almost surely, 2^116671781 is an apocalyptic number.

It is an amenable number.

116671781 is a deficient number, since it is larger than the sum of its proper divisors (604711).

116671781 is an equidigital number, since it uses as much as digits as its factorization.

116671781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604710.

The product of its digits is 14112, while the sum is 38.

The square root of 116671781 is about 10801.4712423818. The cubic root of 116671781 is about 488.6395429379.

The spelling of 116671781 in words is "one hundred sixteen million, six hundred seventy-one thousand, seven hundred eighty-one".