629990851 has 4 divisors (see below), whose sum is σ = 719989552. Its totient is φ = 539992152.

The previous prime is 629990843. The next prime is 629990857. The reversal of 629990851 is 158099926.

629990851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 629990851 - 2³ = 629990843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 629990795 and 629990804.

It is not an unprimeable number, because it can be changed into a prime (629990857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44999340 + ... + 44999353.

It is an arithmetic number, because the mean of its divisors is an integer number (179997388).

Almost surely, 2^629990851 is an apocalyptic number.

629990851 is a deficient number, since it is larger than the sum of its proper divisors (89998701).

629990851 is an equidigital number, since it uses as much as digits as its factorization.

629990851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89998700.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 629990851 is about 25099.6185429181. The cubic root of 629990851 is about 857.2577384287.

The spelling of 629990851 in words is "six hundred twenty-nine million, nine hundred ninety thousand, eight hundred fifty-one".