1331411581 has 2 divisors, whose sum is σ = 1331411582. Its totient is φ = 1331411580.

The previous prime is 1331411579. The next prime is 1331411651. The reversal of 1331411581 is 1851141331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1097596900 + 233814681 = 33130^2 + 15291^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331411581 - 2¹ = 1331411579 is a prime.

It is a super-2 number, since 2×1331411581² = 3545313596041839122, which contains 22 as substring.

Together with 1331411579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331411561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665705790 + 665705791.

It is an arithmetic number, because the mean of its divisors is an integer number (665705791).

Almost surely, 2^1331411581 is an apocalyptic number.

It is an amenable number.

1331411581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331411581 is an equidigital number, since it uses as much as digits as its factorization.

1331411581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 1331411581 is about 36488.5130006691. The cubic root of 1331411581 is about 1100.1133715106.

The spelling of 1331411581 in words is "one billion, three hundred thirty-one million, four hundred eleven thousand, five hundred eighty-one".