631280539 has 4 divisors (see below), whose sum is σ = 631352880. Its totient is φ = 631208200.

The previous prime is 631280537. The next prime is 631280543. The reversal of 631280539 is 935082136.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 631280539 - 2¹ = 631280537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631280498 and 631280507.

It is not an unprimeable number, because it can be changed into a prime (631280537) 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, 20944 + ... + 41245.

It is an arithmetic number, because the mean of its divisors is an integer number (157838220).

Almost surely, 2^631280539 is an apocalyptic number.

631280539 is a deficient number, since it is larger than the sum of its proper divisors (72341).

631280539 is a wasteful number, since it uses less digits than its factorization.

631280539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72340.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 631280539 is about 25125.2967942669. The cubic root of 631280539 is about 857.8423191055.

The spelling of 631280539 in words is "six hundred thirty-one million, two hundred eighty thousand, five hundred thirty-nine".