1326999081 has 16 divisors (see below), whose sum is σ = 1869292800. Its totient is φ = 835984128.

The previous prime is 1326999067. The next prime is 1326999131. The reversal of 1326999081 is 1809996231.

It is not a de Polignac number, because 1326999081 - 2¹⁴ = 1326982697 is a prime.

It is a super-2 number, since 2×1326999081² = 3521853121949689122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1326999081.

It is not an unprimeable number, because it can be changed into a prime (1326999041) 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, 158176 + ... + 166353.

It is an arithmetic number, because the mean of its divisors is an integer number (116830800).

Almost surely, 2^1326999081 is an apocalyptic number.

It is an amenable number.

1326999081 is a deficient number, since it is larger than the sum of its proper divisors (542293719).

1326999081 is a wasteful number, since it uses less digits than its factorization.

1326999081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324608.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 1326999081 is about 36427.9985862523. The cubic root of 1326999081 is about 1098.8967122419.

The spelling of 1326999081 in words is "one billion, three hundred twenty-six million, nine hundred ninety-nine thousand, eighty-one".