628961999 has 2 divisors, whose sum is σ = 628962000. Its totient is φ = 628961998.

The previous prime is 628961969. The next prime is 628962013. The reversal of 628961999 is 999169826.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628961999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628961969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314480999 + 314481000.

It is an arithmetic number, because the mean of its divisors is an integer number (314481000).

Almost surely, 2^628961999 is an apocalyptic number.

628961999 is a deficient number, since it is larger than the sum of its proper divisors (1).

628961999 is an equidigital number, since it uses as much as digits as its factorization.

628961999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 59.

The square root of 628961999 is about 25079.1147969780. The cubic root of 628961999 is about 856.7908152945.

The spelling of 628961999 in words is "six hundred twenty-eight million, nine hundred sixty-one thousand, nine hundred ninety-nine".