631949137 has 4 divisors (see below), whose sum is σ = 632171520. Its totient is φ = 631726756.

The previous prime is 631949119. The next prime is 631949141. The reversal of 631949137 is 731949136.

631949137 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 a de Polignac number, because none of the positive numbers 2^k-631949137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631949093 and 631949102.

It is not an unprimeable number, because it can be changed into a prime (631949107) 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, 106873 + ... + 112630.

It is an arithmetic number, because the mean of its divisors is an integer number (158042880).

Almost surely, 2^631949137 is an apocalyptic number.

It is an amenable number.

631949137 is a deficient number, since it is larger than the sum of its proper divisors (222383).

631949137 is a wasteful number, since it uses less digits than its factorization.

631949137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222382.

The product of its digits is 122472, while the sum is 43.

The square root of 631949137 is about 25138.5985488452. The cubic root of 631949137 is about 858.1450631614.

Subtracting 631949137 from its reverse (731949136), we obtain a palindrome (99999999).

The spelling of 631949137 in words is "six hundred thirty-one million, nine hundred forty-nine thousand, one hundred thirty-seven".