261000490 has 32 divisors (see below), whose sum is σ = 500541120. Its totient is φ = 97645824.

The previous prime is 261000449. The next prime is 261000521. The reversal of 261000490 is 94000162.

It is a super-3 number, since 3×261000490³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23001 + ... + 32419.

It is an arithmetic number, because the mean of its divisors is an integer number (15641910).

Almost surely, 2^261000490 is an apocalyptic number.

261000490 is a deficient number, since it is larger than the sum of its proper divisors (239540630).

261000490 is a wasteful number, since it uses less digits than its factorization.

261000490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9606.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 261000490 is about 16155.5095865157. The cubic root of 261000490 is about 639.0680527671.

The spelling of 261000490 in words is "two hundred sixty-one million, four hundred ninety", and thus it is an aban number.