111987973 has 2 divisors, whose sum is σ = 111987974. Its totient is φ = 111987972.

The previous prime is 111987923. The next prime is 111987977. The reversal of 111987973 is 379789111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110187009 + 1800964 = 10497^2 + 1342^2 .

It is a cyclic number.

It is not a de Polignac number, because 111987973 - 2²¹ = 109890821 is a prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55993986 + 55993987.

It is an arithmetic number, because the mean of its divisors is an integer number (55993987).

Almost surely, 2^111987973 is an apocalyptic number.

It is an amenable number.

111987973 is a deficient number, since it is larger than the sum of its proper divisors (1).

111987973 is an equidigital number, since it uses as much as digits as its factorization.

111987973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 46.

The square root of 111987973 is about 10582.4370066634. The cubic root of 111987973 is about 482.0111981811.

The spelling of 111987973 in words is "one hundred eleven million, nine hundred eighty-seven thousand, nine hundred seventy-three".