107911981 has 4 divisors (see below), whose sum is σ = 107932864. Its totient is φ = 107891100.

The previous prime is 107911957. The next prime is 107911997. The reversal of 107911981 is 189119701.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189119701 = 29 ⋅6521369.

It is a cyclic number.

It is not a de Polignac number, because 107911981 - 2¹⁷ = 107780909 is a prime.

It is a super-2 number, since 2×107911981² = 23289991286688722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 107911981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (107911931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3646 + ... + 15136.

It is an arithmetic number, because the mean of its divisors is an integer number (26983216).

Almost surely, 2^107911981 is an apocalyptic number.

It is an amenable number.

107911981 is a deficient number, since it is larger than the sum of its proper divisors (20883).

107911981 is an equidigital number, since it uses as much as digits as its factorization.

107911981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20882.

The product of its (nonzero) digits is 4536, while the sum is 37.

The square root of 107911981 is about 10388.0691661155. The cubic root of 107911981 is about 476.0909087130.

The spelling of 107911981 in words is "one hundred seven million, nine hundred eleven thousand, nine hundred eighty-one".