628051309 has 2 divisors, whose sum is σ = 628051310. Its totient is φ = 628051308.

The previous prime is 628051301. The next prime is 628051321. The reversal of 628051309 is 903150826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 543356100 + 84695209 = 23310^2 + 9203^2 .

It is a cyclic number.

It is not a de Polignac number, because 628051309 - 2³ = 628051301 is a prime.

It is a super-2 number, since 2×628051309² = 788896893473226962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628051301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314025654 + 314025655.

It is an arithmetic number, because the mean of its divisors is an integer number (314025655).

Almost surely, 2^628051309 is an apocalyptic number.

It is an amenable number.

628051309 is a deficient number, since it is larger than the sum of its proper divisors (1).

628051309 is an equidigital number, since it uses as much as digits as its factorization.

628051309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 628051309 is about 25060.9518773729. The cubic root of 628051309 is about 856.3770925135.

The spelling of 628051309 in words is "six hundred twenty-eight million, fifty-one thousand, three hundred nine".