631230641 has 4 divisors (see below), whose sum is σ = 631286784. Its totient is φ = 631174500.

The previous prime is 631230599. The next prime is 631230643. The reversal of 631230641 is 146032136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 631230641 - 2¹⁰ = 631229617 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 631230641.

It is not an unprimeable number, because it can be changed into a prime (631230643) 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, 4745 + ... + 35846.

It is an arithmetic number, because the mean of its divisors is an integer number (157821696).

Almost surely, 2^631230641 is an apocalyptic number.

It is an amenable number.

631230641 is a deficient number, since it is larger than the sum of its proper divisors (56143).

631230641 is a wasteful number, since it uses less digits than its factorization.

631230641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56142.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 631230641 is about 25124.3037913491. The cubic root of 631230641 is about 857.8197165058.

Adding to 631230641 its reverse (146032136), we get a palindrome (777262777).

The spelling of 631230641 in words is "six hundred thirty-one million, two hundred thirty thousand, six hundred forty-one".