122639189851 has 2 divisors, whose sum is σ = 122639189852. Its totient is φ = 122639189850.

The previous prime is 122639189833. The next prime is 122639189891. The reversal of 122639189851 is 158981936221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122639189851 - 2¹⁵ = 122639157083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122639189792 and 122639189801.

It is not a weakly prime, because it can be changed into another prime (122639189891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61319594925 + 61319594926.

It is an arithmetic number, because the mean of its divisors is an integer number (61319594926).

Almost surely, 2^122639189851 is an apocalyptic number.

122639189851 is a deficient number, since it is larger than the sum of its proper divisors (1).

122639189851 is an equidigital number, since it uses as much as digits as its factorization.

122639189851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 55.

The spelling of 122639189851 in words is "one hundred twenty-two billion, six hundred thirty-nine million, one hundred eighty-nine thousand, eight hundred fifty-one".