428634931 has 2 divisors, whose sum is σ = 428634932. Its totient is φ = 428634930.

The previous prime is 428634929. The next prime is 428634953. The reversal of 428634931 is 139436824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428634931 - 2¹ = 428634929 is a prime.

It is a super-2 number, since 2×428634931² = 367455808146749522, which contains 22 as substring.

Together with 428634929, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (428634431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214317465 + 214317466.

It is an arithmetic number, because the mean of its divisors is an integer number (214317466).

Almost surely, 2^428634931 is an apocalyptic number.

428634931 is a deficient number, since it is larger than the sum of its proper divisors (1).

428634931 is an equidigital number, since it uses as much as digits as its factorization.

428634931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 428634931 is about 20703.5004528220. The cubic root of 428634931 is about 753.9846773406.

The spelling of 428634931 in words is "four hundred twenty-eight million, six hundred thirty-four thousand, nine hundred thirty-one".