261828969 has 4 divisors (see below), whose sum is σ = 349105296. Its totient is φ = 174552644.

The previous prime is 261828943. The next prime is 261828971. The reversal of 261828969 is 969828162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261828969 - 2⁵ = 261828937 is a prime.

It is a super-2 number, since 2×261828969² = 137108818015205922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261828979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43638159 + ... + 43638164.

It is an arithmetic number, because the mean of its divisors is an integer number (87276324).

Almost surely, 2^261828969 is an apocalyptic number.

It is an amenable number.

261828969 is a deficient number, since it is larger than the sum of its proper divisors (87276327).

261828969 is an equidigital number, since it uses as much as digits as its factorization.

261828969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87276326.

The product of its digits is 746496, while the sum is 51.

The square root of 261828969 is about 16181.1300285240. The cubic root of 261828969 is about 639.7435243487.

The spelling of 261828969 in words is "two hundred sixty-one million, eight hundred twenty-eight thousand, nine hundred sixty-nine".