628131271 has 4 divisors (see below), whose sum is σ = 649791000. Its totient is φ = 606471544.

The previous prime is 628131253. The next prime is 628131293. The reversal of 628131271 is 172131826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 172131826 = 2 ⋅86065913.

It is a cyclic number.

It is not a de Polignac number, because 628131271 - 2⁵ = 628131239 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 (628131071) 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, 10829821 + ... + 10829878.

It is an arithmetic number, because the mean of its divisors is an integer number (162447750).

Almost surely, 2^628131271 is an apocalyptic number.

628131271 is a deficient number, since it is larger than the sum of its proper divisors (21659729).

628131271 is a wasteful number, since it uses less digits than its factorization.

628131271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21659728.

The product of its digits is 4032, while the sum is 31.

The square root of 628131271 is about 25062.5471770130. The cubic root of 628131271 is about 856.4134349366.

The spelling of 628131271 in words is "six hundred twenty-eight million, one hundred thirty-one thousand, two hundred seventy-one".