1326999131 has 2 divisors, whose sum is σ = 1326999132. Its totient is φ = 1326999130.

The previous prime is 1326999067. The next prime is 1326999173. The reversal of 1326999131 is 1319996231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1326999131 - 2⁶ = 1326999067 is a prime.

It is a super-2 number, since 2×1326999131² = 3521853387349510322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1326999181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663499565 + 663499566.

It is an arithmetic number, because the mean of its divisors is an integer number (663499566).

Almost surely, 2^1326999131 is an apocalyptic number.

1326999131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326999131 is an equidigital number, since it uses as much as digits as its factorization.

1326999131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 44.

The square root of 1326999131 is about 36427.9992725376. Note that the first 3 decimals coincide. The cubic root of 1326999131 is about 1098.8967260437.

The spelling of 1326999131 in words is "one billion, three hundred twenty-six million, nine hundred ninety-nine thousand, one hundred thirty-one".