111916109609 has 2 divisors, whose sum is σ = 111916109610. Its totient is φ = 111916109608.

The previous prime is 111916109551. The next prime is 111916109623. The reversal of 111916109609 is 906901619111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62314138384 + 49601971225 = 249628^2 + 222715^2 .

It is a cyclic number.

It is not a de Polignac number, because 111916109609 - 2⁸ = 111916109353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111916109609.

It is not a weakly prime, because it can be changed into another prime (111916199609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55958054804 + 55958054805.

It is an arithmetic number, because the mean of its divisors is an integer number (55958054805).

Almost surely, 2^111916109609 is an apocalyptic number.

It is an amenable number.

111916109609 is a deficient number, since it is larger than the sum of its proper divisors (1).

111916109609 is an equidigital number, since it uses as much as digits as its factorization.

111916109609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 111916109609 in words is "one hundred eleven billion, nine hundred sixteen million, one hundred nine thousand, six hundred nine".