261704351 has 4 divisors (see below), whose sum is σ = 264402432. Its totient is φ = 259006272.

The previous prime is 261704279. The next prime is 261704431. The reversal of 261704351 is 153407162.

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

It is a cyclic number.

It is not a de Polignac number, because 261704351 - 2²⁶ = 194595487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261704251) 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 3 ways as a sum of consecutive naturals, for example, 1348895 + ... + 1349088.

It is an arithmetic number, because the mean of its divisors is an integer number (66100608).

Almost surely, 2^261704351 is an apocalyptic number.

261704351 is a deficient number, since it is larger than the sum of its proper divisors (2698081).

261704351 is an equidigital number, since it uses as much as digits as its factorization.

261704351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698080.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 261704351 is about 16177.2788502888. The cubic root of 261704351 is about 639.6420125230.

The spelling of 261704351 in words is "two hundred sixty-one million, seven hundred four thousand, three hundred fifty-one".