210428131 has 4 divisors (see below), whose sum is σ = 210633264. Its totient is φ = 210223000.

The previous prime is 210428123. The next prime is 210428171. The reversal of 210428131 is 131824012.

It is a happy number.

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 210428131 - 2³ = 210428123 is a prime.

It is a super-2 number, since 2×210428131² = 88559996632306322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210428171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101020 + ... + 103081.

It is an arithmetic number, because the mean of its divisors is an integer number (52658316).

Almost surely, 2^210428131 is an apocalyptic number.

210428131 is a deficient number, since it is larger than the sum of its proper divisors (205133).

210428131 is a wasteful number, since it uses less digits than its factorization.

210428131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205132.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 210428131 is about 14506.1411478036. The cubic root of 210428131 is about 594.7958539817.

The spelling of 210428131 in words is "two hundred ten million, four hundred twenty-eight thousand, one hundred thirty-one".