1331320440451 has 2 divisors, whose sum is σ = 1331320440452. Its totient is φ = 1331320440450.

The previous prime is 1331320440431. The next prime is 1331320440487. The reversal of 1331320440451 is 1540440231331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331320440451 - 2⁵ = 1331320440419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331320440431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665660220225 + 665660220226.

It is an arithmetic number, because the mean of its divisors is an integer number (665660220226).

Almost surely, 2^{1331320440451} is an apocalyptic number.

1331320440451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331320440451 is an equidigital number, since it uses as much as digits as its factorization.

1331320440451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 1331320440451 its reverse (1540440231331), we get a palindrome (2871760671782).

It can be divided in two parts, 1331320 and 440451, that added together give a palindrome (1771771).

The spelling of 1331320440451 in words is "one trillion, three hundred thirty-one billion, three hundred twenty million, four hundred forty thousand, four hundred fifty-one".