261607425 has 12 divisors (see below), whose sum is σ = 432524400. Its totient is φ = 139523920.

The previous prime is 261607421. The next prime is 261607433. The reversal of 261607425 is 524706162.

It is not a de Polignac number, because 261607425 - 2² = 261607421 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261607421) 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 11 ways as a sum of consecutive naturals, for example, 1743975 + ... + 1744124.

It is an arithmetic number, because the mean of its divisors is an integer number (36043700).

Almost surely, 2^261607425 is an apocalyptic number.

261607425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261607425 is a deficient number, since it is larger than the sum of its proper divisors (170916975).

261607425 is a wasteful number, since it uses less digits than its factorization.

261607425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488112 (or 3488107 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 261607425 is about 16174.2828279958. The cubic root of 261607425 is about 639.5630358750.

The spelling of 261607425 in words is "two hundred sixty-one million, six hundred seven thousand, four hundred twenty-five".