261430225 has 24 divisors (see below), whose sum is σ = 372172608. Its totient is φ = 178449600.

The previous prime is 261430219. The next prime is 261430231. The reversal of 261430225 is 522034162.

It is an interprime number because it is at equal distance from previous prime (261430219) and next prime (261430231).

It is a de Polignac number, because none of the positive numbers 2^k-261430225 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261430225.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36435 + ... + 43015.

It is an arithmetic number, because the mean of its divisors is an integer number (15507192).

Almost surely, 2^261430225 is an apocalyptic number.

261430225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261430225 is a deficient number, since it is larger than the sum of its proper divisors (110742383).

261430225 is a wasteful number, since it uses less digits than its factorization.

261430225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6825 (or 6820 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 261430225 is about 16168.8040683286. The cubic root of 261430225 is about 639.4186004131.

Adding to 261430225 its reverse (522034162), we get a palindrome (783464387).

The spelling of 261430225 in words is "two hundred sixty-one million, four hundred thirty thousand, two hundred twenty-five".