128121077 has 8 divisors (see below), whose sum is σ = 147408000. Its totient is φ = 109080144.

The previous prime is 128121073. The next prime is 128121079. The reversal of 128121077 is 770121821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128121077 - 2² = 128121073 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 (128121073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60377 + ... + 62462.

It is an arithmetic number, because the mean of its divisors is an integer number (18426000).

Almost surely, 2^128121077 is an apocalyptic number.

It is an amenable number.

128121077 is a deficient number, since it is larger than the sum of its proper divisors (19286923).

128121077 is a wasteful number, since it uses less digits than its factorization.

128121077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122995.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 128121077 is about 11319.0581321946. The cubic root of 128121077 is about 504.1272734864.

Adding to 128121077 its reverse (770121821), we get a palindrome (898242898).

The spelling of 128121077 in words is "one hundred twenty-eight million, one hundred twenty-one thousand, seventy-seven".