428031531 has 6 divisors (see below), whose sum is σ = 618267780. Its totient is φ = 285354348.

The previous prime is 428031509. The next prime is 428031613. The reversal of 428031531 is 135130824.

It is a happy number.

It is not a de Polignac number, because 428031531 - 2¹⁰ = 428030507 is a prime.

It is a super-2 number, since 2×428031531² = 366421983060407922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 428031495 and 428031504.

It is not an unprimeable number, because it can be changed into a prime (428031731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23779521 + ... + 23779538.

It is an arithmetic number, because the mean of its divisors is an integer number (103044630).

Almost surely, 2^428031531 is an apocalyptic number.

428031531 is a deficient number, since it is larger than the sum of its proper divisors (190236249).

428031531 is a wasteful number, since it uses less digits than its factorization.

428031531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47559065 (or 47559062 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 428031531 is about 20688.9229057484. The cubic root of 428031531 is about 753.6307102294.

The spelling of 428031531 in words is "four hundred twenty-eight million, thirty-one thousand, five hundred thirty-one".