541561261 has 8 divisors (see below), whose sum is σ = 552707064. Its totient is φ = 530449920.

The previous prime is 541561249. The next prime is 541561277. The reversal of 541561261 is 162165145.

It can be written as a sum of positive squares in 4 ways, for example, as 4202500 + 537358761 = 2050^2 + 23181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 541561261 - 2²¹ = 539464109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (541561861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24421 + ... + 40981.

It is an arithmetic number, because the mean of its divisors is an integer number (69088383).

Almost surely, 2^541561261 is an apocalyptic number.

It is an amenable number.

541561261 is a deficient number, since it is larger than the sum of its proper divisors (11145803).

541561261 is a wasteful number, since it uses less digits than its factorization.

541561261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17231.

The product of its digits is 7200, while the sum is 31.

The square root of 541561261 is about 23271.4688191356. The cubic root of 541561261 is about 815.1093288038.

The spelling of 541561261 in words is "five hundred forty-one million, five hundred sixty-one thousand, two hundred sixty-one".