107781985 has 4 divisors (see below), whose sum is σ = 129338388. Its totient is φ = 86225584.

The previous prime is 107781977. The next prime is 107782007. The reversal of 107781985 is 589187701.

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 41977441 + 65804544 = 6479^2 + 8112^2 .

It is a cyclic number.

It is not a de Polignac number, because 107781985 - 2³ = 107781977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10778194 + ... + 10778203.

It is an arithmetic number, because the mean of its divisors is an integer number (32334597).

Almost surely, 2^107781985 is an apocalyptic number.

It is an amenable number.

107781985 is a deficient number, since it is larger than the sum of its proper divisors (21556403).

107781985 is an equidigital number, since it uses as much as digits as its factorization.

107781985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21556402.

The product of its (nonzero) digits is 141120, while the sum is 46.

The square root of 107781985 is about 10381.8102949341. The cubic root of 107781985 is about 475.8996578383.

The spelling of 107781985 in words is "one hundred seven million, seven hundred eighty-one thousand, nine hundred eighty-five".