261006025 has 24 divisors (see below), whose sum is σ = 374968064. Its totient is φ = 176515200.

The previous prime is 261006023. The next prime is 261006043. The reversal of 261006025 is 520600162.

It is not a de Polignac number, because 261006025 - 2¹ = 261006023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261005987 and 261006005.

It is not an unprimeable number, because it can be changed into a prime (261006023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2560 + ... + 22990.

Almost surely, 2^261006025 is an apocalyptic number.

261006025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261006025 is a deficient number, since it is larger than the sum of its proper divisors (113962039).

261006025 is a wasteful number, since it uses less digits than its factorization.

261006025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20521 (or 20516 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 261006025 is about 16155.6808893962. The cubic root of 261006025 is about 639.0725702767.

Adding to 261006025 its reverse (520600162), we get a palindrome (781606187).

The spelling of 261006025 in words is "two hundred sixty-one million, six thousand, twenty-five".