111217391 has 2 divisors, whose sum is σ = 111217392. Its totient is φ = 111217390.

The previous prime is 111217363. The next prime is 111217409. The reversal of 111217391 is 193712111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111217391 - 2¹⁴ = 111201007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111217391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111217321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55608695 + 55608696.

It is an arithmetic number, because the mean of its divisors is an integer number (55608696).

Almost surely, 2^111217391 is an apocalyptic number.

111217391 is a deficient number, since it is larger than the sum of its proper divisors (1).

111217391 is an equidigital number, since it uses as much as digits as its factorization.

111217391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 26.

The square root of 111217391 is about 10545.9656267219. The cubic root of 111217391 is about 480.9030900468.

The spelling of 111217391 in words is "one hundred eleven million, two hundred seventeen thousand, three hundred ninety-one".