1331327012509 has 16 divisors (see below), whose sum is σ = 1555100452080. Its totient is φ = 1128417546240.

The previous prime is 1331327012507. The next prime is 1331327012537. The reversal of 1331327012509 is 9052107231331.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3020052025 + 1328306960484 = 54955^2 + 1152522^2 .

It is not a de Polignac number, because 1331327012509 - 2¹ = 1331327012507 is a prime.

It is a super-2 number, since 2×1331327012509² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331327012507) 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, 73455624 + ... + 73473745.

It is an arithmetic number, because the mean of its divisors is an integer number (97193778255).

Almost surely, 2^{1331327012509} is an apocalyptic number.

It is an amenable number.

1331327012509 is a deficient number, since it is larger than the sum of its proper divisors (223773439571).

1331327012509 is a wasteful number, since it uses less digits than its factorization.

1331327012509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146929440.

The product of its (nonzero) digits is 34020, while the sum is 37.

The spelling of 1331327012509 in words is "one trillion, three hundred thirty-one billion, three hundred twenty-seven million, twelve thousand, five hundred nine".