261897343 has 8 divisors (see below), whose sum is σ = 275992416. Its totient is φ = 248028000.

The previous prime is 261897341. The next prime is 261897353. The reversal of 261897343 is 343798162.

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 261897343 - 2¹ = 261897341 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 261897343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261897341) 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 7 ways as a sum of consecutive naturals, for example, 54048 + ... + 58693.

It is an arithmetic number, because the mean of its divisors is an integer number (34499052).

Almost surely, 2^261897343 is an apocalyptic number.

261897343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261897343 is a deficient number, since it is larger than the sum of its proper divisors (14095073).

261897343 is a wasteful number, since it uses less digits than its factorization.

261897343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112865.

The product of its digits is 217728, while the sum is 43.

The square root of 261897343 is about 16183.2426602335. The cubic root of 261897343 is about 639.7992070295.

The spelling of 261897343 in words is "two hundred sixty-one million, eight hundred ninety-seven thousand, three hundred forty-three".