631761643243 has 4 divisors (see below), whose sum is σ = 631870893648. Its totient is φ = 631652392840.

The previous prime is 631761643237. The next prime is 631761643297. The reversal of 631761643243 is 342346167136.

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 631761643243 - 2⁵ = 631761643211 is a prime.

It is a super-3 number, since 3×631761643243³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631761643193 and 631761643202.

It is not an unprimeable number, because it can be changed into a prime (631761643343) 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, 54616528 + ... + 54628093.

It is an arithmetic number, because the mean of its divisors is an integer number (157967723412).

Almost surely, 2^631761643243 is an apocalyptic number.

631761643243 is a deficient number, since it is larger than the sum of its proper divisors (109250405).

631761643243 is a wasteful number, since it uses less digits than its factorization.

631761643243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109250404.

The product of its digits is 1306368, while the sum is 46.

The spelling of 631761643243 in words is "six hundred thirty-one billion, seven hundred sixty-one million, six hundred forty-three thousand, two hundred forty-three".