261355015 has 16 divisors (see below), whose sum is σ = 322311168. Its totient is φ = 203350176.

The previous prime is 261355001. The next prime is 261355027. The reversal of 261355015 is 510553162.

It is a cyclic number.

It is not a de Polignac number, because 261355015 - 2⁷ = 261354887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34894 + ... + 41716.

It is an arithmetic number, because the mean of its divisors is an integer number (20144448).

Almost surely, 2^261355015 is an apocalyptic number.

261355015 is a deficient number, since it is larger than the sum of its proper divisors (60956153).

261355015 is a wasteful number, since it uses less digits than its factorization.

261355015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7038.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 261355015 is about 16166.4781260484. The cubic root of 261355015 is about 639.3572771220.

The spelling of 261355015 in words is "two hundred sixty-one million, three hundred fifty-five thousand, fifteen".