628519891 has 2 divisors, whose sum is σ = 628519892. Its totient is φ = 628519890.

The previous prime is 628519877. The next prime is 628519961. The reversal of 628519891 is 198915826.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628519891 - 2¹¹ = 628517843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628519811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314259945 + 314259946.

It is an arithmetic number, because the mean of its divisors is an integer number (314259946).

Almost surely, 2^628519891 is an apocalyptic number.

628519891 is a deficient number, since it is larger than the sum of its proper divisors (1).

628519891 is an equidigital number, since it uses as much as digits as its factorization.

628519891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 49.

The square root of 628519891 is about 25070.2989810652. The cubic root of 628519891 is about 856.5900173329.

The spelling of 628519891 in words is "six hundred twenty-eight million, five hundred nineteen thousand, eight hundred ninety-one".