261317063 has 16 divisors (see below), whose sum is σ = 306848256. Its totient is φ = 217879200.

The previous prime is 261317041. The next prime is 261317101. The reversal of 261317063 is 360713162.

It is not a de Polignac number, because 261317063 - 2⁸ = 261316807 is a prime.

It is a super-3 number, since 3×261317063³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261317033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77513 + ... + 80813.

It is an arithmetic number, because the mean of its divisors is an integer number (19178016).

Almost surely, 2^261317063 is an apocalyptic number.

261317063 is a deficient number, since it is larger than the sum of its proper divisors (45531193).

261317063 is a wasteful number, since it uses less digits than its factorization.

261317063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 261317063 is about 16165.3042965482. The cubic root of 261317063 is about 639.3263280800.

The spelling of 261317063 in words is "two hundred sixty-one million, three hundred seventeen thousand, sixty-three".