261165487 has 8 divisors (see below), whose sum is σ = 287430480. Its totient is φ = 235320960.

The previous prime is 261165479. The next prime is 261165517. The reversal of 261165487 is 784561162.

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

It is a cyclic number.

It is not a de Polignac number, because 261165487 - 2³ = 261165479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261165287) 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, 103812 + ... + 106297.

It is an arithmetic number, because the mean of its divisors is an integer number (35928810).

Almost surely, 2^261165487 is an apocalyptic number.

261165487 is a deficient number, since it is larger than the sum of its proper divisors (26264993).

261165487 is a wasteful number, since it uses less digits than its factorization.

261165487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210233.

The product of its digits is 80640, while the sum is 40.

The square root of 261165487 is about 16160.6153038800. The cubic root of 261165487 is about 639.2026912112.

The spelling of 261165487 in words is "two hundred sixty-one million, one hundred sixty-five thousand, four hundred eighty-seven".