631640337 has 4 divisors (see below), whose sum is σ = 842187120. Its totient is φ = 421093556.

The previous prime is 631640293. The next prime is 631640341. The reversal of 631640337 is 733046136.

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 631640337 - 2¹¹ = 631638289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631640298 and 631640307.

It is not an unprimeable number, because it can be changed into a prime (631640437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105273387 + ... + 105273392.

It is an arithmetic number, because the mean of its divisors is an integer number (210546780).

Almost surely, 2^631640337 is an apocalyptic number.

It is an amenable number.

631640337 is a deficient number, since it is larger than the sum of its proper divisors (210546783).

631640337 is a wasteful number, since it uses less digits than its factorization.

631640337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210546782.

The product of its (nonzero) digits is 27216, while the sum is 33.

The square root of 631640337 is about 25132.4558489615. The cubic root of 631640337 is about 858.0052637405.

The spelling of 631640337 in words is "six hundred thirty-one million, six hundred forty thousand, three hundred thirty-seven".