631676721437 has 4 divisors (see below), whose sum is σ = 632048954556. Its totient is φ = 631304488320.

The previous prime is 631676721433. The next prime is 631676721449. The reversal of 631676721437 is 734127676136.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 310064103556 + 321612617881 = 556834^2 + 567109^2 .

It is a cyclic number.

It is not a de Polignac number, because 631676721437 - 2² = 631676721433 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631676721433) 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, 186114014 + ... + 186117407.

It is an arithmetic number, because the mean of its divisors is an integer number (158012238639).

Almost surely, 2^631676721437 is an apocalyptic number.

It is an amenable number.

631676721437 is a deficient number, since it is larger than the sum of its proper divisors (372233119).

631676721437 is a wasteful number, since it uses less digits than its factorization.

631676721437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372233118.

The product of its digits is 5334336, while the sum is 53.

The spelling of 631676721437 in words is "six hundred thirty-one billion, six hundred seventy-six million, seven hundred twenty-one thousand, four hundred thirty-seven".