628331971 has 2 divisors, whose sum is σ = 628331972. Its totient is φ = 628331970.

The previous prime is 628331939. The next prime is 628331987. The reversal of 628331971 is 179133826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628331971 - 2⁵ = 628331939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628331771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314165985 + 314165986.

It is an arithmetic number, because the mean of its divisors is an integer number (314165986).

Almost surely, 2^628331971 is an apocalyptic number.

628331971 is a deficient number, since it is larger than the sum of its proper divisors (1).

628331971 is an equidigital number, since it uses as much as digits as its factorization.

628331971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 628331971 is about 25066.5508397147. The cubic root of 628331971 is about 856.5046387348.

The spelling of 628331971 in words is "six hundred twenty-eight million, three hundred thirty-one thousand, nine hundred seventy-one".