1631344225431 has 4 divisors (see below), whose sum is σ = 2175125633912. Its totient is φ = 1087562816952.

The previous prime is 1631344225421. The next prime is 1631344225439. The reversal of 1631344225431 is 1345224431361.

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

It is not a de Polignac number, because 1631344225431 - 2³⁹ = 1081588411543 is a prime.

It is a super-2 number, since 2×1631344225431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1631344225431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631344225439) 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, 271890704236 + ... + 271890704241.

It is an arithmetic number, because the mean of its divisors is an integer number (543781408478).

Almost surely, 2^{1631344225431} is an apocalyptic number.

1631344225431 is a deficient number, since it is larger than the sum of its proper divisors (543781408481).

1631344225431 is an equidigital number, since it uses as much as digits as its factorization.

1631344225431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543781408480.

The product of its digits is 207360, while the sum is 39.

Adding to 1631344225431 its reverse (1345224431361), we get a palindrome (2976568656792).

The spelling of 1631344225431 in words is "one trillion, six hundred thirty-one billion, three hundred forty-four million, two hundred twenty-five thousand, four hundred thirty-one".