1261513325 has 12 divisors (see below), whose sum is σ = 1565007348. Its totient is φ = 1008739200.

The previous prime is 1261513313. The next prime is 1261513327. The reversal of 1261513325 is 5233151621.

It can be written as a sum of positive squares in 6 ways, for example, as 674856484 + 586656841 = 25978^2 + 24221^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1261513325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261513327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48929 + ... + 70121.

It is an arithmetic number, because the mean of its divisors is an integer number (130417279).

Almost surely, 2^1261513325 is an apocalyptic number.

It is an amenable number.

1261513325 is a deficient number, since it is larger than the sum of its proper divisors (303494023).

1261513325 is a wasteful number, since it uses less digits than its factorization.

1261513325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23584 (or 23579 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 1261513325 is about 35517.7888529114. The cubic root of 1261513325 is about 1080.5145367741.

Adding to 1261513325 its reverse (5233151621), we get a palindrome (6494664946).

The spelling of 1261513325 in words is "one billion, two hundred sixty-one million, five hundred thirteen thousand, three hundred twenty-five".