541661921 has 6 divisors (see below), whose sum is σ = 547970130. Its totient is φ = 535358736.

The previous prime is 541661903. The next prime is 541661929. The reversal of 541661921 is 129166145.

It can be written as a sum of positive squares in only one way, i.e., 389509696 + 152152225 = 19736^2 + 12335^2 .

It is not a de Polignac number, because 541661921 - 2²² = 537467617 is a prime.

It is a super-2 number, since 2×541661921² = 586795273322820482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (541661929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218330 + ... + 220796.

It is an arithmetic number, because the mean of its divisors is an integer number (91328355).

Almost surely, 2^541661921 is an apocalyptic number.

It is an amenable number.

541661921 is a deficient number, since it is larger than the sum of its proper divisors (6308209).

541661921 is an frugal number, since it uses more digits than its factorization.

541661921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023 (or 2556 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 541661921 is about 23273.6314527836. The cubic root of 541661921 is about 815.1598271364.

The spelling of 541661921 in words is "five hundred forty-one million, six hundred sixty-one thousand, nine hundred twenty-one".