261520125 has 16 divisors (see below), whose sum is σ = 435170112. Its totient is φ = 139477200.

The previous prime is 261520111. The next prime is 261520151. The reversal of 261520125 is 521025162.

It is a happy number.

It is not a de Polignac number, because 261520125 - 2⁵ = 261520093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261520095 and 261520104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348319 + ... + 349068.

It is an arithmetic number, because the mean of its divisors is an integer number (27198132).

Almost surely, 2^261520125 is an apocalyptic number.

261520125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261520125 is a deficient number, since it is larger than the sum of its proper divisors (173649987).

261520125 is an equidigital number, since it uses as much as digits as its factorization.

261520125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697405 (or 697395 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 261520125 is about 16171.5838741912. The cubic root of 261520125 is about 639.4918859259.

Adding to 261520125 its reverse (521025162), we get a palindrome (782545287).

The spelling of 261520125 in words is "two hundred sixty-one million, five hundred twenty thousand, one hundred twenty-five".