261534441 has 16 divisors (see below), whose sum is σ = 412272000. Its totient is φ = 144294528.

The previous prime is 261534439. The next prime is 261534451. The reversal of 261534441 is 144435162.

It is not a de Polignac number, because 261534441 - 2¹ = 261534439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261534399 and 261534408.

It is not an unprimeable number, because it can be changed into a prime (261534431) 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 15 ways as a sum of consecutive naturals, for example, 214116 + ... + 215333.

It is an arithmetic number, because the mean of its divisors is an integer number (25767000).

Almost surely, 2^261534441 is an apocalyptic number.

261534441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

261534441 is a deficient number, since it is larger than the sum of its proper divisors (150737559).

261534441 is a wasteful number, since it uses less digits than its factorization.

261534441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429488.

The product of its digits is 11520, while the sum is 30.

The square root of 261534441 is about 16172.0264963918. The cubic root of 261534441 is about 639.5035546248.

The spelling of 261534441 in words is "two hundred sixty-one million, five hundred thirty-four thousand, four hundred forty-one".