428202631 has 2 divisors, whose sum is σ = 428202632. Its totient is φ = 428202630.

The previous prime is 428202623. The next prime is 428202641. The reversal of 428202631 is 136202824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428202631 - 2³ = 428202623 is a prime.

It is a super-2 number, since 2×428202631² = 366714986390644322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 428202631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428202611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214101315 + 214101316.

It is an arithmetic number, because the mean of its divisors is an integer number (214101316).

Almost surely, 2^428202631 is an apocalyptic number.

428202631 is a deficient number, since it is larger than the sum of its proper divisors (1).

428202631 is an equidigital number, since it uses as much as digits as its factorization.

428202631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 428202631 is about 20693.0575556151. The cubic root of 428202631 is about 753.7311148549.

It can be divided in two parts, 42820 and 2631, that added together give a triangular number (45451 = T₃₀₁).

The spelling of 428202631 in words is "four hundred twenty-eight million, two hundred two thousand, six hundred thirty-one".