261869345 has 8 divisors (see below), whose sum is σ = 314870976. Its totient is φ = 209076976.

The previous prime is 261869341. The next prime is 261869347. The reversal of 261869345 is 543968162.

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 261869345 - 2² = 261869341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261869296 and 261869305.

It is not an unprimeable number, because it can be changed into a prime (261869341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49547 + ... + 54576.

It is an arithmetic number, because the mean of its divisors is an integer number (39358872).

Almost surely, 2^261869345 is an apocalyptic number.

It is an amenable number.

261869345 is a deficient number, since it is larger than the sum of its proper divisors (53001631).

261869345 is a wasteful number, since it uses less digits than its factorization.

261869345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104631.

The product of its digits is 311040, while the sum is 44.

The square root of 261869345 is about 16182.3776065200. The cubic root of 261869345 is about 639.7764070826.

The spelling of 261869345 in words is "two hundred sixty-one million, eight hundred sixty-nine thousand, three hundred forty-five".