1331880709581 has 12 divisors (see below), whose sum is σ = 2036994026652. Its totient is φ = 835689856896.

The previous prime is 1331880709519. The next prime is 1331880709681. The reversal of 1331880709581 is 1859070881331.

It is a happy number.

1331880709581 is a `hidden beast` number, since 1 + 331 + 8 + 80 + 70 + 95 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 625791744900 + 706088964681 = 791070^2 + 840291^2 .

It is not a de Polignac number, because 1331880709581 - 2⁶ = 1331880709517 is a prime.

It is a super-2 number, since 2×1331880709581² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331880709681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4352551186 + ... + 4352551491.

It is an arithmetic number, because the mean of its divisors is an integer number (169749502221).

Almost surely, 2^{1331880709581} is an apocalyptic number.

It is an amenable number.

1331880709581 is a deficient number, since it is larger than the sum of its proper divisors (705113317071).

1331880709581 is a wasteful number, since it uses less digits than its factorization.

1331880709581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8705102700 (or 8705102697 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 1331880709581 in words is "one trillion, three hundred thirty-one billion, eight hundred eighty million, seven hundred nine thousand, five hundred eighty-one".