1405444401631 has 2 divisors, whose sum is σ = 1405444401632. Its totient is φ = 1405444401630.

The previous prime is 1405444401623. The next prime is 1405444401679. The reversal of 1405444401631 is 1361044445041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1405444401631 - 2³ = 1405444401623 is a prime.

It is a super-2 number, since 2×1405444401631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1405444401731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702722200815 + 702722200816.

It is an arithmetic number, because the mean of its divisors is an integer number (702722200816).

Almost surely, 2^{1405444401631} is an apocalyptic number.

1405444401631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405444401631 is an equidigital number, since it uses as much as digits as its factorization.

1405444401631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 37.

Adding to 1405444401631 its reverse (1361044445041), we get a palindrome (2766488846672).

The spelling of 1405444401631 in words is "one trillion, four hundred five billion, four hundred forty-four million, four hundred one thousand, six hundred thirty-one".