261301025 has 24 divisors (see below), whose sum is σ = 329379960. Its totient is φ = 205608960.

The previous prime is 261301021. The next prime is 261301031. The reversal of 261301025 is 520103162.

It can be written as a sum of positive squares in 12 ways, for example, as 154654096 + 106646929 = 12436^2 + 10327^2 .

It is not a de Polignac number, because 261301025 - 2² = 261301021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261300988 and 261301006.

It is not an unprimeable number, because it can be changed into a prime (261301021) 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 in 23 ways as a sum of consecutive naturals, for example, 671531 + ... + 671919.

It is an arithmetic number, because the mean of its divisors is an integer number (13724165).

Almost surely, 2^261301025 is an apocalyptic number.

261301025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261301025 is a deficient number, since it is larger than the sum of its proper divisors (68078935).

261301025 is a wasteful number, since it uses less digits than its factorization.

261301025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 261301025 is about 16164.8082265148. The cubic root of 261301025 is about 639.3132485343.

Adding to 261301025 its reverse (520103162), we get a palindrome (781404187).

The spelling of 261301025 in words is "two hundred sixty-one million, three hundred one thousand, twenty-five".