631401211 has 12 divisors (see below), whose sum is σ = 758182080. Its totient is φ = 523741680.

The previous prime is 631401203. The next prime is 631401257. The reversal of 631401211 is 112104136.

It is not a de Polignac number, because 631401211 - 2³ = 631401203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631401011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 206316 + ... + 209353.

It is an arithmetic number, because the mean of its divisors is an integer number (63181840).

Almost surely, 2^631401211 is an apocalyptic number.

631401211 is a deficient number, since it is larger than the sum of its proper divisors (126780869).

631401211 is a wasteful number, since it uses less digits than its factorization.

631401211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415714 (or 415707 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 631401211 is about 25127.6980839869. The cubic root of 631401211 is about 857.8969757104.

Adding to 631401211 its reverse (112104136), we get a palindrome (743505347).

The spelling of 631401211 in words is "six hundred thirty-one million, four hundred one thousand, two hundred eleven".