1325461561 has 2 divisors, whose sum is σ = 1325461562. Its totient is φ = 1325461560.

The previous prime is 1325461531. The next prime is 1325461573. The reversal of 1325461561 is 1651645231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1008443536 + 317018025 = 31756^2 + 17805^2 .

It is an emirp because it is prime and its reverse (1651645231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1325461561 - 2¹³ = 1325453369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1325461531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662730780 + 662730781.

It is an arithmetic number, because the mean of its divisors is an integer number (662730781).

Almost surely, 2^1325461561 is an apocalyptic number.

It is an amenable number.

1325461561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325461561 is an equidigital number, since it uses as much as digits as its factorization.

1325461561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 1325461561 is about 36406.8889222905. Note that the first 3 decimals coincide. The cubic root of 1325461561 is about 1098.4721380638.

The spelling of 1325461561 in words is "one billion, three hundred twenty-five million, four hundred sixty-one thousand, five hundred sixty-one".