628430531 has 2 divisors, whose sum is σ = 628430532. Its totient is φ = 628430530.

The previous prime is 628430527. The next prime is 628430549. The reversal of 628430531 is 135034826.

628430531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628430531 - 2² = 628430527 is a prime.

It is a super-2 number, since 2×628430531² = 789849864585883922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (628430521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314215265 + 314215266.

It is an arithmetic number, because the mean of its divisors is an integer number (314215266).

Almost surely, 2^628430531 is an apocalyptic number.

628430531 is a deficient number, since it is larger than the sum of its proper divisors (1).

628430531 is an equidigital number, since it uses as much as digits as its factorization.

628430531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 628430531 is about 25068.5167291565. The cubic root of 628430531 is about 856.5494200965.

The spelling of 628430531 in words is "six hundred twenty-eight million, four hundred thirty thousand, five hundred thirty-one".