629921 has 2 divisors, whose sum is σ = 629922. Its totient is φ = 629920.

The previous prime is 629903. The next prime is 629927. The reversal of 629921 is 129926.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583696 + 46225 = 764^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 629921 - 2⁶ = 629857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (629927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314960 + 314961.

It is an arithmetic number, because the mean of its divisors is an integer number (314961).

2⁶²⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

629921 is a deficient number, since it is larger than the sum of its proper divisors (1).

629921 is an equidigital number, since it uses as much as digits as its factorization.

629921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 629921 is about 793.6756264369. The cubic root of 629921 is about 85.7226054094.

The spelling of 629921 in words is "six hundred twenty-nine thousand, nine hundred twenty-one".