1331401765989 has 16 divisors (see below), whose sum is σ = 1779275636928. Its totient is φ = 885566126592.

The previous prime is 1331401765987. The next prime is 1331401766011. The reversal of 1331401765989 is 9895671041331.

It is not a de Polignac number, because 1331401765989 - 2¹ = 1331401765987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331401765987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3172894 + ... + 3567920.

It is an arithmetic number, because the mean of its divisors is an integer number (111204727308).

Almost surely, 2^{1331401765989} is an apocalyptic number.

It is an amenable number.

1331401765989 is a deficient number, since it is larger than the sum of its proper divisors (447873870939).

1331401765989 is a wasteful number, since it uses less digits than its factorization.

1331401765989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397604.

The product of its (nonzero) digits is 4898880, while the sum is 57.

The spelling of 1331401765989 in words is "one trillion, three hundred thirty-one billion, four hundred one million, seven hundred sixty-five thousand, nine hundred eighty-nine".