261995343 has 16 divisors (see below), whose sum is σ = 360053760. Its totient is φ = 169369056.

The previous prime is 261995333. The next prime is 261995387. The reversal of 261995343 is 343599162.

It is a happy number.

It is not a de Polignac number, because 261995343 - 2⁵ = 261995311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261995295 and 261995304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261995333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6846 + ... + 23892.

It is an arithmetic number, because the mean of its divisors is an integer number (22503360).

Almost surely, 2^261995343 is an apocalyptic number.

261995343 is a deficient number, since it is larger than the sum of its proper divisors (98058417).

261995343 is a wasteful number, since it uses less digits than its factorization.

261995343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17206.

The product of its digits is 174960, while the sum is 42.

The square root of 261995343 is about 16186.2702003890. The cubic root of 261995343 is about 639.8789997485.

The spelling of 261995343 in words is "two hundred sixty-one million, nine hundred ninety-five thousand, three hundred forty-three".