261425 has 6 divisors (see below), whose sum is σ = 324198. Its totient is φ = 209120.

The previous prime is 261407. The next prime is 261427. The reversal of 261425 is 524162.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 57121 + 204304 = 239^2 + 452^2 .

It is not a de Polignac number, because 261425 - 2⁸ = 261169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261397 and 261406.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261425.

It is not an unprimeable number, because it can be changed into a prime (261427) 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, 5204 + ... + 5253.

It is an arithmetic number, because the mean of its divisors is an integer number (54033).

2²⁶¹⁴²⁵ is an apocalyptic number.

261425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261425 is a deficient number, since it is larger than the sum of its proper divisors (62773).

261425 is a wasteful number, since it uses less digits than its factorization.

261425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10467 (or 10462 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 261425 is about 511.2973694437. The cubic root of 261425 is about 63.9414340533.

Adding to 261425 its reverse (524162), we get a palindrome (785587).

It can be divided in two parts, 261 and 425, that added together give a palindrome (686).

The spelling of 261425 in words is "two hundred sixty-one thousand, four hundred twenty-five".