541390981 has 4 divisors (see below), whose sum is σ = 541601100. Its totient is φ = 541180864.

The previous prime is 541390963. The next prime is 541390987. The reversal of 541390981 is 189093145.

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

It can be written as a sum of positive squares in 2 ways, for example, as 438693025 + 102697956 = 20945^2 + 10134^2 .

It is a cyclic number.

It is not a de Polignac number, because 541390981 - 2²³ = 533002373 is a prime.

It is a super-2 number, since 2×541390981² = 586208388616284722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (541390987) 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 3 ways as a sum of consecutive naturals, for example, 101146 + ... + 106363.

It is an arithmetic number, because the mean of its divisors is an integer number (135400275).

Almost surely, 2^541390981 is an apocalyptic number.

It is an amenable number.

541390981 is a deficient number, since it is larger than the sum of its proper divisors (210119).

541390981 is a wasteful number, since it uses less digits than its factorization.

541390981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210118.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 541390981 is about 23267.8099742971. The cubic root of 541390981 is about 815.0238897987.

The spelling of 541390981 in words is "five hundred forty-one million, three hundred ninety thousand, nine hundred eighty-one".