107919991 has 4 divisors (see below), whose sum is σ = 111641400. Its totient is φ = 104198584.

The previous prime is 107919989. The next prime is 107919997. The reversal of 107919991 is 199919701.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 107919991 - 2¹ = 107919989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (107919997) 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, 1860661 + ... + 1860718.

It is an arithmetic number, because the mean of its divisors is an integer number (27910350).

Almost surely, 2^107919991 is an apocalyptic number.

107919991 is a deficient number, since it is larger than the sum of its proper divisors (3721409).

107919991 is an equidigital number, since it uses as much as digits as its factorization.

107919991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721408.

The product of its (nonzero) digits is 45927, while the sum is 46.

The square root of 107919991 is about 10388.4546974033. The cubic root of 107919991 is about 476.1026880471.

The spelling of 107919991 in words is "one hundred seven million, nine hundred nineteen thousand, nine hundred ninety-one".