261758969 has 4 divisors (see below), whose sum is σ = 262186596. Its totient is φ = 261331344.

The previous prime is 261758951. The next prime is 261758977. The reversal of 261758969 is 969857162.

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 46403344 + 215355625 = 6812^2 + 14675^2 .

It is a cyclic number.

It is not a de Polignac number, because 261758969 - 2¹² = 261754873 is a prime.

It is a super-2 number, since 2×261758969² = 137035515703885922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261758969.

It is not an unprimeable number, because it can be changed into a prime (261758909) 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, 212894 + ... + 214119.

It is an arithmetic number, because the mean of its divisors is an integer number (65546649).

Almost surely, 2^261758969 is an apocalyptic number.

It is an amenable number.

261758969 is a deficient number, since it is larger than the sum of its proper divisors (427627).

261758969 is an equidigital number, since it uses as much as digits as its factorization.

261758969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427626.

The product of its digits is 1632960, while the sum is 53.

The square root of 261758969 is about 16178.9668706009. The cubic root of 261758969 is about 639.6865074364.

The spelling of 261758969 in words is "two hundred sixty-one million, seven hundred fifty-eight thousand, nine hundred sixty-nine".