261490269 has 8 divisors (see below), whose sum is σ = 350479872. Its totient is φ = 173413760.

The previous prime is 261490259. The next prime is 261490283. The reversal of 261490269 is 962094162.

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 261490269 - 2⁴ = 261490253 is a prime.

It is a super-2 number, since 2×261490269² = 136754321563384722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261490219) 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, 227604 + ... + 228749.

It is an arithmetic number, because the mean of its divisors is an integer number (43809984).

Almost surely, 2^261490269 is an apocalyptic number.

It is an amenable number.

261490269 is a deficient number, since it is larger than the sum of its proper divisors (88989603).

261490269 is a wasteful number, since it uses less digits than its factorization.

261490269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456547.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 261490269 is about 16170.6607471680. The cubic root of 261490269 is about 639.4675494988.

The spelling of 261490269 in words is "two hundred sixty-one million, four hundred ninety thousand, two hundred sixty-nine".