631366129 has 3 divisors (see below), whose sum is σ = 631391257. Its totient is φ = 631341002.

The previous prime is 631366121. The next prime is 631366133. The reversal of 631366129 is 921663136.

The square root of 631366129 is 25127.

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

631366129 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, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 631366129 - 2³ = 631366121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631366121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12564 + ... + 37690.

Almost surely, 2^631366129 is an apocalyptic number.

631366129 is the 25127-th square number.

631366129 is the 12564-th centered octagonal number.

It is an amenable number.

631366129 is a deficient number, since it is larger than the sum of its proper divisors (25128).

631366129 is an frugal number, since it uses more digits than its factorization.

631366129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50254 (or 25127 counting only the distinct ones).

The product of its digits is 34992, while the sum is 37.

The cubic root of 631366129 is about 857.8810865533.

The spelling of 631366129 in words is "six hundred thirty-one million, three hundred sixty-six thousand, one hundred twenty-nine".