540823981 has 4 divisors (see below), whose sum is σ = 541144000. Its totient is φ = 540503964.

The previous prime is 540823979. The next prime is 540824041. The reversal of 540823981 is 189328045.

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 540823981 - 2¹ = 540823979 is a prime.

It is a super-2 number, since 2×540823981² = 584981156849376722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540823901) 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 3 ways as a sum of consecutive naturals, for example, 157461 + ... + 160858.

It is an arithmetic number, because the mean of its divisors is an integer number (135286000).

Almost surely, 2^540823981 is an apocalyptic number.

It is an amenable number.

540823981 is a deficient number, since it is larger than the sum of its proper divisors (320019).

540823981 is a wasteful number, since it uses less digits than its factorization.

540823981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320018.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 540823981 is about 23255.6225674567. The cubic root of 540823981 is about 814.7392649578.

The spelling of 540823981 in words is "five hundred forty million, eight hundred twenty-three thousand, nine hundred eighty-one".