629891 has 2 divisors, whose sum is σ = 629892. Its totient is φ = 629890.

The previous prime is 629873. The next prime is 629897. The reversal of 629891 is 198926.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 629891 - 2¹⁴ = 613507 is a prime.

It is not a weakly prime, because it can be changed into another prime (629897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314945 + 314946.

It is an arithmetic number, because the mean of its divisors is an integer number (314946).

2⁶²⁹⁸⁹¹ is an apocalyptic number.

629891 is a deficient number, since it is larger than the sum of its proper divisors (1).

629891 is an equidigital number, since it uses as much as digits as its factorization.

629891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 629891 is about 793.6567268032. The cubic root of 629891 is about 85.7212445408.

Adding to 629891 its sum of digits (35), we get a palindrome (629926).

The spelling of 629891 in words is "six hundred twenty-nine thousand, eight hundred ninety-one".