122128590877 has 4 divisors (see below), whose sum is σ = 122433151356. Its totient is φ = 121824030400.

The previous prime is 122128590847. The next prime is 122128590893. The reversal of 122128590877 is 778095821221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89795516281 + 32333074596 = 299659^2 + 179814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122128590877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122128590817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152279638 + ... + 152280439.

It is an arithmetic number, because the mean of its divisors is an integer number (30608287839).

Almost surely, 2^122128590877 is an apocalyptic number.

It is an amenable number.

122128590877 is a deficient number, since it is larger than the sum of its proper divisors (304560479).

122128590877 is an equidigital number, since it uses as much as digits as its factorization.

122128590877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304560478.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 122128590877 in words is "one hundred twenty-two billion, one hundred twenty-eight million, five hundred ninety thousand, eight hundred seventy-seven".