111967997 has 2 divisors, whose sum is σ = 111967998. Its totient is φ = 111967996.

The previous prime is 111967981. The next prime is 111968009. The reversal of 111967997 is 799769111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95043001 + 16924996 = 9749^2 + 4114^2 .

It is an emirp because it is prime and its reverse (799769111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111967997 - 2⁴ = 111967981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111967937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55983998 + 55983999.

It is an arithmetic number, because the mean of its divisors is an integer number (55983999).

Almost surely, 2^111967997 is an apocalyptic number.

It is an amenable number.

111967997 is a deficient number, since it is larger than the sum of its proper divisors (1).

111967997 is an equidigital number, since it uses as much as digits as its factorization.

111967997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 214326, while the sum is 50.

The square root of 111967997 is about 10581.4931366041. The cubic root of 111967997 is about 481.9825366859.

The spelling of 111967997 in words is "one hundred eleven million, nine hundred sixty-seven thousand, nine hundred ninety-seven".