261437343 has 16 divisors (see below), whose sum is σ = 364214016. Its totient is φ = 166496000.

The previous prime is 261437329. The next prime is 261437357. The reversal of 261437343 is 343734162.

It is an interprime number because it is at equal distance from previous prime (261437329) and next prime (261437357).

It is a cyclic number.

It is not a de Polignac number, because 261437343 - 2⁵ = 261437311 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261437303) 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 15 ways as a sum of consecutive naturals, for example, 63343 + ... + 67343.

It is an arithmetic number, because the mean of its divisors is an integer number (22763376).

Almost surely, 2^261437343 is an apocalyptic number.

261437343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261437343 is a deficient number, since it is larger than the sum of its proper divisors (102776673).

261437343 is a wasteful number, since it uses less digits than its factorization.

261437343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974.

The product of its digits is 36288, while the sum is 33.

The square root of 261437343 is about 16169.0241820587. The cubic root of 261437343 is about 639.4244035425.

The spelling of 261437343 in words is "two hundred sixty-one million, four hundred thirty-seven thousand, three hundred forty-three".