629620991 has 2 divisors, whose sum is σ = 629620992. Its totient is φ = 629620990.

The previous prime is 629620967. The next prime is 629621009. The reversal of 629620991 is 199026926.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-629620991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (629620931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314810495 + 314810496.

It is an arithmetic number, because the mean of its divisors is an integer number (314810496).

Almost surely, 2^629620991 is an apocalyptic number.

629620991 is a deficient number, since it is larger than the sum of its proper divisors (1).

629620991 is an equidigital number, since it uses as much as digits as its factorization.

629620991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 629620991 is about 25092.2496201516. The cubic root of 629620991 is about 857.0899437085.

The spelling of 629620991 in words is "six hundred twenty-nine million, six hundred twenty thousand, nine hundred ninety-one".