631684243 has 4 divisors (see below), whose sum is σ = 634890960. Its totient is φ = 628477528.

The previous prime is 631684217. The next prime is 631684247. The reversal of 631684243 is 342486136.

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 631684243 - 2¹³ = 631676051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631684247) 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, 1603063 + ... + 1603456.

It is an arithmetic number, because the mean of its divisors is an integer number (158722740).

Almost surely, 2^631684243 is an apocalyptic number.

631684243 is a deficient number, since it is larger than the sum of its proper divisors (3206717).

631684243 is a wasteful number, since it uses less digits than its factorization.

631684243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206716.

The product of its digits is 82944, while the sum is 37.

The square root of 631684243 is about 25133.3293258175. The cubic root of 631684243 is about 858.0251435698.

The spelling of 631684243 in words is "six hundred thirty-one million, six hundred eighty-four thousand, two hundred forty-three".