628132991 has 2 divisors, whose sum is σ = 628132992. Its totient is φ = 628132990.

The previous prime is 628132963. The next prime is 628133021. The reversal of 628132991 is 199231826.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628132991 - 2⁶ = 628132927 is a prime.

It is a Chen prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314066495 + 314066496.

It is an arithmetic number, because the mean of its divisors is an integer number (314066496).

Almost surely, 2^628132991 is an apocalyptic number.

628132991 is a deficient number, since it is larger than the sum of its proper divisors (1).

628132991 is an equidigital number, since it uses as much as digits as its factorization.

628132991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 628132991 is about 25062.5814911393. The cubic root of 628132991 is about 856.4142166361.

The spelling of 628132991 in words is "six hundred twenty-eight million, one hundred thirty-two thousand, nine hundred ninety-one".