261028469 has 4 divisors (see below), whose sum is σ = 281107596. Its totient is φ = 240949344.

The previous prime is 261028399. The next prime is 261028477. The reversal of 261028469 is 964820162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23406244 + 237622225 = 4838^2 + 15415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261028469 is a prime.

It is a super-2 number, since 2×261028469² = 136271723256967922, which contains 22 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 (261028069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10039544 + ... + 10039569.

It is an arithmetic number, because the mean of its divisors is an integer number (70276899).

Almost surely, 2^261028469 is an apocalyptic number.

It is an amenable number.

261028469 is a deficient number, since it is larger than the sum of its proper divisors (20079127).

261028469 is a wasteful number, since it uses less digits than its factorization.

261028469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20079126.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 261028469 is about 16156.3754908086. The cubic root of 261028469 is about 639.0908877768.

The spelling of 261028469 in words is "two hundred sixty-one million, twenty-eight thousand, four hundred sixty-nine".