261836441 has 4 divisors (see below), whose sum is σ = 263077584. Its totient is φ = 260595300.

The previous prime is 261836437. The next prime is 261836453. The reversal of 261836441 is 144638162.

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 261836441 - 2² = 261836437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261836741) 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, 620255 + ... + 620676.

It is an arithmetic number, because the mean of its divisors is an integer number (65769396).

Almost surely, 2^261836441 is an apocalyptic number.

It is an amenable number.

261836441 is a deficient number, since it is larger than the sum of its proper divisors (1241143).

261836441 is a wasteful number, since it uses less digits than its factorization.

261836441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241142.

The product of its digits is 27648, while the sum is 35.

The square root of 261836441 is about 16181.3609131000. The cubic root of 261836441 is about 639.7496098966.

The spelling of 261836441 in words is "two hundred sixty-one million, eight hundred thirty-six thousand, four hundred forty-one".