31641843813551 has 4 divisors (see below), whose sum is σ = 31643194263504. Its totient is φ = 31640493363600.

The previous prime is 31641843813511. The next prime is 31641843813599. The reversal of 31641843813551 is 15531834814613.

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 31641843813551 - 2¹⁸ = 31641843551407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31641843813493 and 31641843813502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31641843813511) 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, 675189830 + ... + 675236691.

It is an arithmetic number, because the mean of its divisors is an integer number (7910798565876).

Almost surely, 2^{31641843813551} is an apocalyptic number.

31641843813551 is a deficient number, since it is larger than the sum of its proper divisors (1350449953).

31641843813551 is a wasteful number, since it uses less digits than its factorization.

31641843813551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350449952.

The product of its digits is 4147200, while the sum is 53.

The spelling of 31641843813551 in words is "thirty-one trillion, six hundred forty-one billion, eight hundred forty-three million, eight hundred thirteen thousand, five hundred fifty-one".