629921137 has 4 divisors (see below), whose sum is σ = 635700340. Its totient is φ = 624141936.

The previous prime is 629921129. The next prime is 629921153. The reversal of 629921137 is 731129926.

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

It can be written as a sum of positive squares in 2 ways, for example, as 475937856 + 153983281 = 21816^2 + 12409^2 .

It is a cyclic number.

It is not a de Polignac number, because 629921137 - 2³ = 629921129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 629921137.

It is not an unprimeable number, because it can be changed into a prime (629921107) 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, 2889438 + ... + 2889655.

It is an arithmetic number, because the mean of its divisors is an integer number (158925085).

Almost surely, 2^629921137 is an apocalyptic number.

It is an amenable number.

629921137 is a deficient number, since it is larger than the sum of its proper divisors (5779203).

629921137 is a wasteful number, since it uses less digits than its factorization.

629921137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5779202.

The product of its digits is 40824, while the sum is 40.

The square root of 629921137 is about 25098.2297582917. The cubic root of 629921137 is about 857.2261162390.

The spelling of 629921137 in words is "six hundred twenty-nine million, nine hundred twenty-one thousand, one hundred thirty-seven".