111950809 has 2 divisors, whose sum is σ = 111950810. Its totient is φ = 111950808.

The previous prime is 111950807. The next prime is 111950843. The reversal of 111950809 is 908059111.

It is an a-pointer prime, because the next prime (111950843) can be obtained adding 111950809 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108160000 + 3790809 = 10400^2 + 1947^2 .

It is a cyclic number.

It is not a de Polignac number, because 111950809 - 2¹ = 111950807 is a prime.

Together with 111950807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111950807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55975404 + 55975405.

It is an arithmetic number, because the mean of its divisors is an integer number (55975405).

Almost surely, 2^111950809 is an apocalyptic number.

It is an amenable number.

111950809 is a deficient number, since it is larger than the sum of its proper divisors (1).

111950809 is an equidigital number, since it uses as much as digits as its factorization.

111950809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 111950809 is about 10580.6809327188. The cubic root of 111950809 is about 481.9578726747.

The spelling of 111950809 in words is "one hundred eleven million, nine hundred fifty thousand, eight hundred nine".