1543021853 has 2 divisors, whose sum is σ = 1543021854. Its totient is φ = 1543021852.

The previous prime is 1543021829. The next prime is 1543021871. The reversal of 1543021853 is 3581203451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883456729 + 659565124 = 29723^2 + 25682^2 .

It is a cyclic number.

It is not a de Polignac number, because 1543021853 - 2¹⁴ = 1543005469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1543021153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771510926 + 771510927.

It is an arithmetic number, because the mean of its divisors is an integer number (771510927).

Almost surely, 2^1543021853 is an apocalyptic number.

It is an amenable number.

1543021853 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543021853 is an equidigital number, since it uses as much as digits as its factorization.

1543021853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1543021853 is about 39281.3168440163. The cubic root of 1543021853 is about 1155.5551894438. Note that the first 3 decimals are identical.

The spelling of 1543021853 in words is "one billion, five hundred forty-three million, twenty-one thousand, eight hundred fifty-three".