111987907 has 2 divisors, whose sum is σ = 111987908. Its totient is φ = 111987906.

The previous prime is 111987871. The next prime is 111987923. The reversal of 111987907 is 709789111.

It is a strong prime.

It is an emirp because it is prime and its reverse (709789111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111987907 - 2¹¹ = 111985859 is a prime.

It is not a weakly prime, because it can be changed into another prime (111987977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55993953 + 55993954.

It is an arithmetic number, because the mean of its divisors is an integer number (55993954).

Almost surely, 2^111987907 is an apocalyptic number.

111987907 is a deficient number, since it is larger than the sum of its proper divisors (1).

111987907 is an equidigital number, since it uses as much as digits as its factorization.

111987907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 43.

The square root of 111987907 is about 10582.4338882886. The cubic root of 111987907 is about 482.0111034901.

The spelling of 111987907 in words is "one hundred eleven million, nine hundred eighty-seven thousand, nine hundred seven".