116645781 has 16 divisors (see below), whose sum is σ = 177897600. Its totient is φ = 66597888.

The previous prime is 116645761. The next prime is 116645783. The reversal of 116645781 is 187546611.

It is not a de Polignac number, because 116645781 - 2¹¹ = 116643733 is a prime.

It is a super-2 number, since 2×116645781² = 27212476450199922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116645783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43405 + ... + 46013.

It is an arithmetic number, because the mean of its divisors is an integer number (11118600).

Almost surely, 2^116645781 is an apocalyptic number.

It is an amenable number.

116645781 is a deficient number, since it is larger than the sum of its proper divisors (61251819).

116645781 is a wasteful number, since it uses less digits than its factorization.

116645781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4748.

The product of its digits is 40320, while the sum is 39.

The square root of 116645781 is about 10800.2676355727. The cubic root of 116645781 is about 488.6032428950.

The spelling of 116645781 in words is "one hundred sixteen million, six hundred forty-five thousand, seven hundred eighty-one".