128119997 has 4 divisors (see below), whose sum is σ = 129924576. Its totient is φ = 126315420.

The previous prime is 128119969. The next prime is 128120029. The reversal of 128119997 is 799911821.

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.

It is a cyclic number.

It is not a de Polignac number, because 128119997 - 2⁶ = 128119933 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 (128119597) 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 3 ways as a sum of consecutive naturals, for example, 902183 + ... + 902324.

It is an arithmetic number, because the mean of its divisors is an integer number (32481144).

Almost surely, 2^128119997 is an apocalyptic number.

It is an amenable number.

128119997 is a deficient number, since it is larger than the sum of its proper divisors (1804579).

128119997 is an equidigital number, since it uses as much as digits as its factorization.

128119997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804578.

The product of its digits is 81648, while the sum is 47.

The square root of 128119997 is about 11319.0104249444. The cubic root of 128119997 is about 504.1258569643.

The spelling of 128119997 in words is "one hundred twenty-eight million, one hundred nineteen thousand, nine hundred ninety-seven".