128977553 has 4 divisors (see below), whose sum is σ = 129224688. Its totient is φ = 128730420.

The previous prime is 128977549. The next prime is 128977559. The reversal of 128977553 is 355779821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355779821 = 137 ⋅2596933.

It is a cyclic number.

It is not a de Polignac number, because 128977553 - 2² = 128977549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128977498 and 128977507.

It is not an unprimeable number, because it can be changed into a prime (128977559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122783 + ... + 123828.

It is an arithmetic number, because the mean of its divisors is an integer number (32306172).

Almost surely, 2^128977553 is an apocalyptic number.

It is an amenable number.

128977553 is a deficient number, since it is larger than the sum of its proper divisors (247135).

128977553 is an equidigital number, since it uses as much as digits as its factorization.

128977553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247134.

The product of its digits is 529200, while the sum is 47.

The square root of 128977553 is about 11356.8284745346. The cubic root of 128977553 is about 505.2481256239.

The spelling of 128977553 in words is "one hundred twenty-eight million, nine hundred seventy-seven thousand, five hundred fifty-three".