261230065 has 8 divisors (see below), whose sum is σ = 321122088. Its totient is φ = 203886720.

The previous prime is 261230063. The next prime is 261230083. The reversal of 261230065 is 560032162.

It can be written as a sum of positive squares in 4 ways, for example, as 633616 + 260596449 = 796^2 + 16143^2 .

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

It is not a de Polignac number, because 261230065 - 2¹ = 261230063 is a prime.

It is a super-2 number, since 2×261230065² = 136482293719808450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261230063) 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, 636942 + ... + 637351.

It is an arithmetic number, because the mean of its divisors is an integer number (40140261).

Almost surely, 2^261230065 is an apocalyptic number.

It is an amenable number.

261230065 is a deficient number, since it is larger than the sum of its proper divisors (59892023).

261230065 is a wasteful number, since it uses less digits than its factorization.

261230065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274339.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 261230065 is about 16162.6131859919. The cubic root of 261230065 is about 639.2553717677.

The spelling of 261230065 in words is "two hundred sixty-one million, two hundred thirty thousand, sixty-five".