128473291 has 4 divisors (see below), whose sum is σ = 128837592. Its totient is φ = 128108992.

The previous prime is 128473273. The next prime is 128473297. The reversal of 128473291 is 192374821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192374821 = 3391 ⋅56731.

It is a cyclic number.

It is not a de Polignac number, because 128473291 - 2¹¹ = 128471243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128473291.

It is not an unprimeable number, because it can be changed into a prime (128473297) 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, 181621 + ... + 182326.

It is an arithmetic number, because the mean of its divisors is an integer number (32209398).

Almost surely, 2^128473291 is an apocalyptic number.

128473291 is a deficient number, since it is larger than the sum of its proper divisors (364301).

128473291 is an equidigital number, since it uses as much as digits as its factorization.

128473291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364300.

The product of its digits is 24192, while the sum is 37.

The square root of 128473291 is about 11334.6059040445. The cubic root of 128473291 is about 504.5888114490.

The spelling of 128473291 in words is "one hundred twenty-eight million, four hundred seventy-three thousand, two hundred ninety-one".