540881 has 4 divisors (see below), whose sum is σ = 590064. Its totient is φ = 491700.

The previous prime is 540877. The next prime is 540901. The reversal of 540881 is 188045.

540881 = 56² + 57² + ... + 121².

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 not a de Polignac number, because 540881 - 2² = 540877 is a prime.

It is a super-2 number, since 2×540881² = 585104512322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 540881.

It is not an unprimeable number, because it can be changed into a prime (540851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24575 + ... + 24596.

It is an arithmetic number, because the mean of its divisors is an integer number (147516).

2⁵⁴⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

540881 is a deficient number, since it is larger than the sum of its proper divisors (49183).

540881 is a wasteful number, since it uses less digits than its factorization.

540881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49182.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 540881 is about 735.4461231117. The cubic root of 540881 is about 81.4767896569.

Subtracting from 540881 its reverse (188045), we obtain a square (352836 = 594²).

The spelling of 540881 in words is "five hundred forty thousand, eight hundred eighty-one".