428131 has 4 divisors (see below), whose sum is σ = 467064. Its totient is φ = 389200.

The previous prime is 428093. The next prime is 428137. The reversal of 428131 is 131824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428131 - 2⁷ = 428003 is a prime.

It is a super-2 number, since 2×428131² = 366592306322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428099 and 428108.

It is not an unprimeable number, because it can be changed into a prime (428137) 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, 19450 + ... + 19471.

It is an arithmetic number, because the mean of its divisors is an integer number (116766).

2⁴²⁸¹³¹ is an apocalyptic number.

428131 is a deficient number, since it is larger than the sum of its proper divisors (38933).

428131 is a wasteful number, since it uses less digits than its factorization.

428131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38932.

The product of its digits is 192, while the sum is 19.

The square root of 428131 is about 654.3172013634. The cubic root of 428131 is about 75.3689083723.

Adding to 428131 its reverse (131824), we get a palindrome (559955).

The spelling of 428131 in words is "four hundred twenty-eight thousand, one hundred thirty-one".