261750231 has 16 divisors (see below), whose sum is σ = 388627200. Its totient is φ = 174118104.

The previous prime is 261750227. The next prime is 261750239. The reversal of 261750231 is 132057162.

It is a happy number.

It is not a de Polignac number, because 261750231 - 2² = 261750227 is a prime.

It is a super-2 number, since 2×261750231² = 137026366857106722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 261750195 and 261750204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261750239) 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, 2230 + ... + 22988.

It is an arithmetic number, because the mean of its divisors is an integer number (24289200).

Almost surely, 2^261750231 is an apocalyptic number.

261750231 is a deficient number, since it is larger than the sum of its proper divisors (126876969).

261750231 is a wasteful number, since it uses less digits than its factorization.

261750231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21235 (or 21229 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 261750231 is about 16178.6968263825. The cubic root of 261750231 is about 639.6793893831.

The spelling of 261750231 in words is "two hundred sixty-one million, seven hundred fifty thousand, two hundred thirty-one".