261745233 has 4 divisors (see below), whose sum is σ = 348993648. Its totient is φ = 174496820.

The previous prime is 261745207. The next prime is 261745241. The reversal of 261745233 is 332547162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261745233 - 2¹⁴ = 261728849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261745194 and 261745203.

It is not an unprimeable number, because it can be changed into a prime (261745283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43624203 + ... + 43624208.

It is an arithmetic number, because the mean of its divisors is an integer number (87248412).

Almost surely, 2^261745233 is an apocalyptic number.

It is an amenable number.

261745233 is a deficient number, since it is larger than the sum of its proper divisors (87248415).

261745233 is an equidigital number, since it uses as much as digits as its factorization.

261745233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87248414.

The product of its digits is 30240, while the sum is 33.

The square root of 261745233 is about 16178.5423632662. The cubic root of 261745233 is about 639.6753178961.

The spelling of 261745233 in words is "two hundred sixty-one million, seven hundred forty-five thousand, two hundred thirty-three".