629457921 has 9 divisors (see below), whose sum is σ = 909325729. Its totient is φ = 419588436.

The previous prime is 629457919. The next prime is 629457923. The reversal of 629457921 is 129754926.

The square root of 629457921 is 25089.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (629457919) and next prime (629457923).

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 629457921 - 2¹ = 629457919 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (629457923) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 71086 + ... + 79448.

Almost surely, 2^629457921 is an apocalyptic number.

629457921 is the 25089-th square number.

629457921 is the 12545-th centered octagonal number.

It is an amenable number.

629457921 is a deficient number, since it is larger than the sum of its proper divisors (279867808).

629457921 is an frugal number, since it uses more digits than its factorization.

629457921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16732 (or 8366 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The cubic root of 629457921 is about 857.0159427210.

The spelling of 629457921 in words is "six hundred twenty-nine million, four hundred fifty-seven thousand, nine hundred twenty-one".