128951287 has 4 divisors (see below), whose sum is σ = 129504960. Its totient is φ = 128397616.

The previous prime is 128951261. The next prime is 128951369. The reversal of 128951287 is 782159821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782159821 = 977 ⋅800573.

It is a cyclic number.

It is not a de Polignac number, because 128951287 - 2¹¹ = 128949239 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 (128951237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276487 + ... + 276952.

It is an arithmetic number, because the mean of its divisors is an integer number (32376240).

Almost surely, 2^128951287 is an apocalyptic number.

128951287 is a deficient number, since it is larger than the sum of its proper divisors (553673).

128951287 is an equidigital number, since it uses as much as digits as its factorization.

128951287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553672.

The product of its digits is 80640, while the sum is 43.

The square root of 128951287 is about 11355.6720188635. The cubic root of 128951287 is about 505.2138257324.

The spelling of 128951287 in words is "one hundred twenty-eight million, nine hundred fifty-one thousand, two hundred eighty-seven".