122455843891 has 2 divisors, whose sum is σ = 122455843892. Its totient is φ = 122455843890.

The previous prime is 122455843877. The next prime is 122455843969. The reversal of 122455843891 is 198348554221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122455843891 - 2¹⁹ = 122455319603 is a prime.

It is not a weakly prime, because it can be changed into another prime (122455844891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61227921945 + 61227921946.

It is an arithmetic number, because the mean of its divisors is an integer number (61227921946).

Almost surely, 2^122455843891 is an apocalyptic number.

122455843891 is a deficient number, since it is larger than the sum of its proper divisors (1).

122455843891 is an equidigital number, since it uses as much as digits as its factorization.

122455843891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2764800, while the sum is 52.

The spelling of 122455843891 in words is "one hundred twenty-two billion, four hundred fifty-five million, eight hundred forty-three thousand, eight hundred ninety-one".