128903791 has 4 divisors (see below), whose sum is σ = 131335992. Its totient is φ = 126471592.

The previous prime is 128903777. The next prime is 128903839. The reversal of 128903791 is 197309821.

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

It is a cyclic number.

It is not a de Polignac number, because 128903791 - 2⁵ = 128903759 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 (128903701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1216021 + ... + 1216126.

It is an arithmetic number, because the mean of its divisors is an integer number (32833998).

Almost surely, 2^128903791 is an apocalyptic number.

128903791 is a deficient number, since it is larger than the sum of its proper divisors (2432201).

128903791 is an equidigital number, since it uses as much as digits as its factorization.

128903791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432200.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 128903791 is about 11353.5805365532. The cubic root of 128903791 is about 505.1517904655.

The spelling of 128903791 in words is "one hundred twenty-eight million, nine hundred three thousand, seven hundred ninety-one".