628219961 has 2 divisors, whose sum is σ = 628219962. Its totient is φ = 628219960.

The previous prime is 628219951. The next prime is 628219967. The reversal of 628219961 is 169912826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612067600 + 16152361 = 24740^2 + 4019^2 .

It is a cyclic number.

It is not a de Polignac number, because 628219961 - 2⁶ = 628219897 is a prime.

It is not a weakly prime, because it can be changed into another prime (628219967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314109980 + 314109981.

It is an arithmetic number, because the mean of its divisors is an integer number (314109981).

Almost surely, 2^628219961 is an apocalyptic number.

It is an amenable number.

628219961 is a deficient number, since it is larger than the sum of its proper divisors (1).

628219961 is an equidigital number, since it uses as much as digits as its factorization.

628219961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 628219961 is about 25064.3164877880. The cubic root of 628219961 is about 856.4537405948.

The spelling of 628219961 in words is "six hundred twenty-eight million, two hundred nineteen thousand, nine hundred sixty-one".