111281620409 has 2 divisors, whose sum is σ = 111281620410. Its totient is φ = 111281620408.

The previous prime is 111281620361. The next prime is 111281620447. The reversal of 111281620409 is 904026182111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74780371600 + 36501248809 = 273460^2 + 191053^2 .

It is a cyclic number.

It is not a de Polignac number, because 111281620409 - 2³² = 106986653113 is a prime.

It is not a weakly prime, because it can be changed into another prime (111281620459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55640810204 + 55640810205.

It is an arithmetic number, because the mean of its divisors is an integer number (55640810205).

Almost surely, 2^111281620409 is an apocalyptic number.

It is an amenable number.

111281620409 is a deficient number, since it is larger than the sum of its proper divisors (1).

111281620409 is an equidigital number, since it uses as much as digits as its factorization.

111281620409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 111281620409 in words is "one hundred eleven billion, two hundred eighty-one million, six hundred twenty thousand, four hundred nine".