1326955381 has 2 divisors, whose sum is σ = 1326955382. Its totient is φ = 1326955380.

The previous prime is 1326955367. The next prime is 1326955391. The reversal of 1326955381 is 1835596231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1001152881 + 325802500 = 31641^2 + 18050^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326955381 - 2⁹ = 1326954869 is a prime.

It is a super-2 number, since 2×1326955381² = 3521621166329710322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1326955391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663477690 + 663477691.

It is an arithmetic number, because the mean of its divisors is an integer number (663477691).

Almost surely, 2^1326955381 is an apocalyptic number.

It is an amenable number.

1326955381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326955381 is an equidigital number, since it uses as much as digits as its factorization.

1326955381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 43.

The square root of 1326955381 is about 36427.3987679604. The cubic root of 1326955381 is about 1098.8846493565.

The spelling of 1326955381 in words is "one billion, three hundred twenty-six million, nine hundred fifty-five thousand, three hundred eighty-one".