6431353145621 has 4 divisors (see below), whose sum is σ = 6540359131200. Its totient is φ = 6322347160044.

The previous prime is 6431353145557. The next prime is 6431353145671. The reversal of 6431353145621 is 1265413531346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6431353145621 - 2⁶ = 6431353145557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6431353145671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54502992701 + ... + 54502992818.

It is an arithmetic number, because the mean of its divisors is an integer number (1635089782800).

Almost surely, 2^{6431353145621} is an apocalyptic number.

It is an amenable number.

6431353145621 is a deficient number, since it is larger than the sum of its proper divisors (109005985579).

6431353145621 is a wasteful number, since it uses less digits than its factorization.

6431353145621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109005985578.

The product of its digits is 777600, while the sum is 44.

Adding to 6431353145621 its reverse (1265413531346), we get a palindrome (7696766676967).

The spelling of 6431353145621 in words is "six trillion, four hundred thirty-one billion, three hundred fifty-three million, one hundred forty-five thousand, six hundred twenty-one".