631001213 has 4 divisors (see below), whose sum is σ = 631401408. Its totient is φ = 630601020.

The previous prime is 631001209. The next prime is 631001233. The reversal of 631001213 is 312100136.

631001213 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631001213 - 2² = 631001209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631001191 and 631001200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631001233) 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, 197723 + ... + 200888.

It is an arithmetic number, because the mean of its divisors is an integer number (157850352).

Almost surely, 2^631001213 is an apocalyptic number.

It is an amenable number.

631001213 is a deficient number, since it is larger than the sum of its proper divisors (400195).

631001213 is a wasteful number, since it uses less digits than its factorization.

631001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400194.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 631001213 is about 25119.7375185331. The cubic root of 631001213 is about 857.7157757812.

Adding to 631001213 its reverse (312100136), we get a palindrome (943101349).

The spelling of 631001213 in words is "six hundred thirty-one million, one thousand, two hundred thirteen".