261525115 has 8 divisors (see below), whose sum is σ = 317611728. Its totient is φ = 206699040.

The previous prime is 261525113. The next prime is 261525151. The reversal of 261525115 is 511525162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261525115 - 2¹ = 261525113 is a prime.

It is a super-3 number, since 3×261525115³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261525113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314676 + ... + 315505.

It is an arithmetic number, because the mean of its divisors is an integer number (39701466).

Almost surely, 2^261525115 is an apocalyptic number.

261525115 is a deficient number, since it is larger than the sum of its proper divisors (56086613).

261525115 is an equidigital number, since it uses as much as digits as its factorization.

261525115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630269.

The product of its digits is 3000, while the sum is 28.

The square root of 261525115 is about 16171.7381564259. The cubic root of 261525115 is about 639.4959532282.

It can be divided in two parts, 2615 and 25115, that added together give a triangular number (27730 = T₂₃₅).

The spelling of 261525115 in words is "two hundred sixty-one million, five hundred twenty-five thousand, one hundred fifteen".