540988709 has 4 divisors (see below), whose sum is σ = 541115820. Its totient is φ = 540861600.

The previous prime is 540988703. The next prime is 540988733. The reversal of 540988709 is 907889045.

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 299186209 + 241802500 = 17297^2 + 15550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540988709 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 (540988703) 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, 56942 + ... + 65759.

It is an arithmetic number, because the mean of its divisors is an integer number (135278955).

Almost surely, 2^540988709 is an apocalyptic number.

It is an amenable number.

540988709 is a deficient number, since it is larger than the sum of its proper divisors (127111).

540988709 is a wasteful number, since it uses less digits than its factorization.

540988709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127110.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 540988709 is about 23259.1639789568. The cubic root of 540988709 is about 814.8219762468.

The spelling of 540988709 in words is "five hundred forty million, nine hundred eighty-eight thousand, seven hundred nine".