1543121 has 4 divisors (see below), whose sum is σ = 1552752. Its totient is φ = 1533492.

The previous prime is 1543111. The next prime is 1543127. The reversal of 1543121 is 1213451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1543121 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 1543121.

It is not an unprimeable number, because it can be changed into a prime (1543127) 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, 4571 + ... + 4896.

It is an arithmetic number, because the mean of its divisors is an integer number (388188).

2^1543121 is an apocalyptic number.

It is an amenable number.

1543121 is a deficient number, since it is larger than the sum of its proper divisors (9631).

1543121 is an equidigital number, since it uses as much as digits as its factorization.

1543121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9630.

The product of its digits is 120, while the sum is 17.

The square root of 1543121 is about 1242.2242148662. The cubic root of 1543121 is about 115.5579939013.

Adding to 1543121 its reverse (1213451), we get a palindrome (2756572).

The spelling of 1543121 in words is "one million, five hundred forty-three thousand, one hundred twenty-one".