111999997 has 2 divisors, whose sum is σ = 111999998. Its totient is φ = 111999996.

The previous prime is 111999991. The next prime is 112000043. The reversal of 111999997 is 799999111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111957561 + 42436 = 10581^2 + 206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111999997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111999991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55999998 + 55999999.

It is an arithmetic number, because the mean of its divisors is an integer number (55999999).

Almost surely, 2^111999997 is an apocalyptic number.

It is an amenable number.

111999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

111999997 is an equidigital number, since it uses as much as digits as its factorization.

111999997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 413343, while the sum is 55.

The square root of 111999997 is about 10583.0051025217. The cubic root of 111999997 is about 482.0284485312.

The spelling of 111999997 in words is "one hundred eleven million, nine hundred ninety-nine thousand, nine hundred ninety-seven".