261136325 has 6 divisors (see below), whose sum is σ = 323809074. Its totient is φ = 208909040.

The previous prime is 261136321. The next prime is 261136327. The reversal of 261136325 is 523631162.

It can be written as a sum of positive squares in 3 ways, for example, as 28665316 + 232471009 = 5354^2 + 15247^2 .

It is not a de Polignac number, because 261136325 - 2² = 261136321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261136321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5222702 + ... + 5222751.

It is an arithmetic number, because the mean of its divisors is an integer number (53968179).

Almost surely, 2^261136325 is an apocalyptic number.

261136325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261136325 is a deficient number, since it is larger than the sum of its proper divisors (62672749).

261136325 is a wasteful number, since it uses less digits than its factorization.

261136325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10445463 (or 10445458 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 261136325 is about 16159.7130234420. The cubic root of 261136325 is about 639.1788989880.

Adding to 261136325 its reverse (523631162), we get a palindrome (784767487).

The spelling of 261136325 in words is "two hundred sixty-one million, one hundred thirty-six thousand, three hundred twenty-five".