261050431 has 4 divisors (see below), whose sum is σ = 270052200. Its totient is φ = 252048664.

The previous prime is 261050423. The next prime is 261050441. The reversal of 261050431 is 134050162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261050431 - 2³ = 261050423 is a prime.

It is a super-2 number, since 2×261050431² = 136294655050571522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261050441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4500841 + ... + 4500898.

It is an arithmetic number, because the mean of its divisors is an integer number (67513050).

Almost surely, 2^261050431 is an apocalyptic number.

261050431 is a deficient number, since it is larger than the sum of its proper divisors (9001769).

261050431 is an equidigital number, since it uses as much as digits as its factorization.

261050431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001768.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 261050431 is about 16157.0551462821. The cubic root of 261050431 is about 639.1088108798.

The spelling of 261050431 in words is "two hundred sixty-one million, fifty thousand, four hundred thirty-one".