122001111509 has 2 divisors, whose sum is σ = 122001111510. Its totient is φ = 122001111508.

The previous prime is 122001111499. The next prime is 122001111523. The reversal of 122001111509 is 905111100221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121175698609 + 825412900 = 348103^2 + 28730^2 .

It is a cyclic number.

It is not a de Polignac number, because 122001111509 - 2²⁴ = 121984334293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122001111569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61000555754 + 61000555755.

It is an arithmetic number, because the mean of its divisors is an integer number (61000555755).

Almost surely, 2^122001111509 is an apocalyptic number.

It is an amenable number.

122001111509 is a deficient number, since it is larger than the sum of its proper divisors (1).

122001111509 is an equidigital number, since it uses as much as digits as its factorization.

122001111509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 23.

The spelling of 122001111509 in words is "one hundred twenty-two billion, one million, one hundred eleven thousand, five hundred nine".