621546131443 has 4 divisors (see below), whose sum is σ = 621588604320. Its totient is φ = 621503658568.

The previous prime is 621546131419. The next prime is 621546131501. The reversal of 621546131443 is 344131645126.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621546131443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621546131396 and 621546131405.

It is not an unprimeable number, because it can be changed into a prime (621546132443) 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, 21214480 + ... + 21243757.

It is an arithmetic number, because the mean of its divisors is an integer number (155397151080).

Almost surely, 2^621546131443 is an apocalyptic number.

621546131443 is a deficient number, since it is larger than the sum of its proper divisors (42472877).

621546131443 is a wasteful number, since it uses less digits than its factorization.

621546131443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42472876.

The product of its digits is 207360, while the sum is 40.

Adding to 621546131443 its reverse (344131645126), we get a palindrome (965677776569).

The spelling of 621546131443 in words is "six hundred twenty-one billion, five hundred forty-six million, one hundred thirty-one thousand, four hundred forty-three".