540143251 has 4 divisors (see below), whose sum is σ = 540649600. Its totient is φ = 539636904.

The previous prime is 540143209. The next prime is 540143257. The reversal of 540143251 is 152341045.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 540143251 - 2²⁷ = 405925523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540143257) 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, 251571 + ... + 253708.

It is an arithmetic number, because the mean of its divisors is an integer number (135162400).

Almost surely, 2^540143251 is an apocalyptic number.

540143251 is a deficient number, since it is larger than the sum of its proper divisors (506349).

540143251 is a wasteful number, since it uses less digits than its factorization.

540143251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506348.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 540143251 is about 23240.9821436186. The cubic root of 540143251 is about 814.3972865820.

Adding to 540143251 its reverse (152341045), we get a palindrome (692484296).

The spelling of 540143251 in words is "five hundred forty million, one hundred forty-three thousand, two hundred fifty-one".