629861 has 2 divisors, whose sum is σ = 629862. Its totient is φ = 629860.

The previous prime is 629857. The next prime is 629873. The reversal of 629861 is 168926.

629861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481636 + 148225 = 694^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 629861 - 2² = 629857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (629891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314930 + 314931.

It is an arithmetic number, because the mean of its divisors is an integer number (314931).

629861 is a Friedman number, since it can be written as 6+6^9/(8*2)-1, using all its digits and the basic arithmetic operations.

2⁶²⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

629861 is a deficient number, since it is larger than the sum of its proper divisors (1).

629861 is an equidigital number, since it uses as much as digits as its factorization.

629861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 629861 is about 793.6378267195. The cubic root of 629861 is about 85.7198836291.

The spelling of 629861 in words is "six hundred twenty-nine thousand, eight hundred sixty-one".