631243723 has 4 divisors (see below), whose sum is σ = 688629528. Its totient is φ = 573857920.

The previous prime is 631243709. The next prime is 631243757. The reversal of 631243723 is 327342136.

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

It is a cyclic number.

It is not a de Polignac number, because 631243723 - 2¹³ = 631235531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631243703) 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, 28692886 + ... + 28692907.

It is an arithmetic number, because the mean of its divisors is an integer number (172157382).

Almost surely, 2^631243723 is an apocalyptic number.

631243723 is a deficient number, since it is larger than the sum of its proper divisors (57385805).

631243723 is a wasteful number, since it uses less digits than its factorization.

631243723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57385804.

The product of its digits is 18144, while the sum is 31.

The square root of 631243723 is about 25124.5641355228. The cubic root of 631243723 is about 857.8256424539.

Adding to 631243723 its reverse (327342136), we get a palindrome (958585859).

The spelling of 631243723 in words is "six hundred thirty-one million, two hundred forty-three thousand, seven hundred twenty-three".