1325810881 has 2 divisors, whose sum is σ = 1325810882. Its totient is φ = 1325810880.

The previous prime is 1325810879. The next prime is 1325810887. The reversal of 1325810881 is 1880185231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1011812481 + 313998400 = 31809^2 + 17720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325810881 - 2¹ = 1325810879 is a prime.

It is a super-2 number, since 2×1325810881² = 3515548984355992322, which contains 22 as substring.

Together with 1325810879, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1325810881.

It is not a weakly prime, because it can be changed into another prime (1325810887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662905440 + 662905441.

It is an arithmetic number, because the mean of its divisors is an integer number (662905441).

Almost surely, 2^1325810881 is an apocalyptic number.

It is an amenable number.

1325810881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325810881 is an equidigital number, since it uses as much as digits as its factorization.

1325810881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 1325810881 is about 36411.6860499483. The cubic root of 1325810881 is about 1098.5686288749.

The spelling of 1325810881 in words is "one billion, three hundred twenty-five million, eight hundred ten thousand, eight hundred eighty-one".