111897131 has 2 divisors, whose sum is σ = 111897132. Its totient is φ = 111897130.

The previous prime is 111897113. The next prime is 111897173. The reversal of 111897131 is 131798111.

It is a happy number.

Together with previous prime (111897113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (131798111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111897131 - 2⁶ = 111897067 is a prime.

It is a super-2 number, since 2×111897131² = 25041935852062322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111897431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55948565 + 55948566.

It is an arithmetic number, because the mean of its divisors is an integer number (55948566).

Almost surely, 2^111897131 is an apocalyptic number.

111897131 is a deficient number, since it is larger than the sum of its proper divisors (1).

111897131 is an equidigital number, since it uses as much as digits as its factorization.

111897131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 32.

The square root of 111897131 is about 10578.1440243551. The cubic root of 111897131 is about 481.8808308894.

The spelling of 111897131 in words is "one hundred eleven million, eight hundred ninety-seven thousand, one hundred thirty-one".