540021251 has 8 divisors (see below), whose sum is σ = 673273344. Its totient is φ = 420795720.

The previous prime is 540021241. The next prime is 540021259. The reversal of 540021251 is 152120045.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 540021251 - 2²² = 535826947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540021259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3506555 + ... + 3506708.

It is an arithmetic number, because the mean of its divisors is an integer number (84159168).

Almost surely, 2^540021251 is an apocalyptic number.

540021251 is a deficient number, since it is larger than the sum of its proper divisors (133252093).

540021251 is a wasteful number, since it uses less digits than its factorization.

540021251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7013281.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 540021251 is about 23238.3573214632. The cubic root of 540021251 is about 814.3359670770.

Adding to 540021251 its reverse (152120045), we get a palindrome (692141296).

The spelling of 540021251 in words is "five hundred forty million, twenty-one thousand, two hundred fifty-one".