261505115 has 8 divisors (see below), whose sum is σ = 314517168. Its totient is φ = 208730080.

The previous prime is 261505043. The next prime is 261505117. The reversal of 261505115 is 511505162.

261505115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 261505115 - 2¹⁰ = 261504091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261505117) 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, 56816 + ... + 61245.

It is an arithmetic number, because the mean of its divisors is an integer number (39314646).

Almost surely, 2^261505115 is an apocalyptic number.

261505115 is a deficient number, since it is larger than the sum of its proper divisors (53012053).

261505115 is a wasteful number, since it uses less digits than its factorization.

261505115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118509.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 261505115 is about 16171.1197818828. The cubic root of 261505115 is about 639.4796511035.

The spelling of 261505115 in words is "two hundred sixty-one million, five hundred five thousand, one hundred fifteen".