1325111261 has 2 divisors, whose sum is σ = 1325111262. Its totient is φ = 1325111260.

The previous prime is 1325111209. The next prime is 1325111273. The reversal of 1325111261 is 1621115231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 905107225 + 420004036 = 30085^2 + 20494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1325111261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1325111201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662555630 + 662555631.

It is an arithmetic number, because the mean of its divisors is an integer number (662555631).

Almost surely, 2^1325111261 is an apocalyptic number.

It is an amenable number.

1325111261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325111261 is an equidigital number, since it uses as much as digits as its factorization.

1325111261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 23.

The square root of 1325111261 is about 36402.0777016917. The cubic root of 1325111261 is about 1098.3753595265.

Adding to 1325111261 its reverse (1621115231), we get a palindrome (2946226492).

The spelling of 1325111261 in words is "one billion, three hundred twenty-five million, one hundred eleven thousand, two hundred sixty-one".