116781 has 16 divisors (see below), whose sum is σ = 182784. Its totient is φ = 64944.

The previous prime is 116747. The next prime is 116789. The reversal of 116781 is 187611.

116781 = 4² + 5² + ... + 70².

It is not a de Polignac number, because 116781 - 2⁹ = 116269 is a prime.

It is a super-2 number, since 2×116781² = 27275603922, which contains 22 as substring.

It is an Ulam number.

116781 is a lucky number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1366 + ... + 1448.

It is an arithmetic number, because the mean of its divisors is an integer number (11424).

2¹¹⁶⁷⁸¹ is an apocalyptic number.

It is an amenable number.

116781 is a deficient number, since it is larger than the sum of its proper divisors (66003).

116781 is an equidigital number, since it uses as much as digits as its factorization.

116781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160.

The product of its digits is 336, while the sum is 24.

The square root of 116781 is about 341.7323514097. The cubic root of 116781 is about 48.8791970764.

The spelling of 116781 in words is "one hundred sixteen thousand, seven hundred eighty-one".