1543136221 has 16 divisors (see below), whose sum is σ = 1693569600. Its totient is φ = 1394426880.

The previous prime is 1543136219. The next prime is 1543136251. The reversal of 1543136221 is 1226313451.

It is not a de Polignac number, because 1543136221 - 2¹ = 1543136219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1543136221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1543136251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1960390 + ... + 1961176.

It is an arithmetic number, because the mean of its divisors is an integer number (105848100).

Almost surely, 2^1543136221 is an apocalyptic number.

1543136221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1543136221 is a deficient number, since it is larger than the sum of its proper divisors (150433379).

1543136221 is a wasteful number, since it uses less digits than its factorization.

1543136221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644.

The product of its digits is 4320, while the sum is 28.

The square root of 1543136221 is about 39282.7725727195. The cubic root of 1543136221 is about 1155.5837384607.

Adding to 1543136221 its reverse (1226313451), we get a palindrome (2769449672).

The spelling of 1543136221 in words is "one billion, five hundred forty-three million, one hundred thirty-six thousand, two hundred twenty-one".