107777991 has 16 divisors (see below), whose sum is σ = 146893824. Its totient is φ = 70266144.

The previous prime is 107777987. The next prime is 107777993. The reversal of 107777991 is 199777701.

It is not a de Polignac number, because 107777991 - 2² = 107777987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 107777991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (107777993) 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, 57430 + ... + 59276.

It is an arithmetic number, because the mean of its divisors is an integer number (9180864).

Almost surely, 2^107777991 is an apocalyptic number.

107777991 is a deficient number, since it is larger than the sum of its proper divisors (39115833).

107777991 is a wasteful number, since it uses less digits than its factorization.

107777991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270.

The product of its (nonzero) digits is 194481, while the sum is 48.

The square root of 107777991 is about 10381.6179374893. The cubic root of 107777991 is about 475.8937794079.

The spelling of 107777991 in words is "one hundred seven million, seven hundred seventy-seven thousand, nine hundred ninety-one".