261172243 has 8 divisors (see below), whose sum is σ = 263438000. Its totient is φ = 258912288.

The previous prime is 261172217. The next prime is 261172283. The reversal of 261172243 is 342271162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261172243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261172283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167833 + ... + 169381.

It is an arithmetic number, because the mean of its divisors is an integer number (32929750).

Almost surely, 2^261172243 is an apocalyptic number.

261172243 is a deficient number, since it is larger than the sum of its proper divisors (2265757).

261172243 is a wasteful number, since it uses less digits than its factorization.

261172243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901.

The product of its digits is 4032, while the sum is 28.

The square root of 261172243 is about 16160.8243292228. The cubic root of 261172243 is about 639.2082029351.

The spelling of 261172243 in words is "two hundred sixty-one million, one hundred seventy-two thousand, two hundred forty-three".