128311551 has 12 divisors (see below), whose sum is σ = 189282912. Its totient is φ = 83720736.

The previous prime is 128311543. The next prime is 128311553. The reversal of 128311551 is 155113821.

It is not a de Polignac number, because 128311551 - 2³ = 128311543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128311553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151246 + ... + 152091.

It is an arithmetic number, because the mean of its divisors is an integer number (15773576).

Almost surely, 2^128311551 is an apocalyptic number.

128311551 is a deficient number, since it is larger than the sum of its proper divisors (60971361).

128311551 is a wasteful number, since it uses less digits than its factorization.

128311551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303390 (or 303387 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 128311551 is about 11327.4688699638. The cubic root of 128311551 is about 504.3769737304.

The spelling of 128311551 in words is "one hundred twenty-eight million, three hundred eleven thousand, five hundred fifty-one".