628220191 has 2 divisors, whose sum is σ = 628220192. Its totient is φ = 628220190.

The previous prime is 628220149. The next prime is 628220233. The reversal of 628220191 is 191022826.

It is a balanced prime because it is at equal distance from previous prime (628220149) and next prime (628220233).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628220191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628220291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314110095 + 314110096.

It is an arithmetic number, because the mean of its divisors is an integer number (314110096).

Almost surely, 2^628220191 is an apocalyptic number.

628220191 is a deficient number, since it is larger than the sum of its proper divisors (1).

628220191 is an equidigital number, since it uses as much as digits as its factorization.

628220191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 628220191 is about 25064.3210759837. The cubic root of 628220191 is about 856.4538451146.

The spelling of 628220191 in words is "six hundred twenty-eight million, two hundred twenty thousand, one hundred ninety-one".