1543531 has 4 divisors (see below), whose sum is σ = 1683864. Its totient is φ = 1403200.

The previous prime is 1543513. The next prime is 1543537. The reversal of 1543531 is 1353451.

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 1543531 - 2⁹ = 1543019 is a prime.

It is a super-2 number, since 2×1543531² = 4764975895922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1543537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70150 + ... + 70171.

It is an arithmetic number, because the mean of its divisors is an integer number (420966).

2^1543531 is an apocalyptic number.

1543531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1543531 is a deficient number, since it is larger than the sum of its proper divisors (140333).

1543531 is a wasteful number, since it uses less digits than its factorization.

1543531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140332.

The product of its digits is 900, while the sum is 22.

The square root of 1543531 is about 1242.3892304749. The cubic root of 1543531 is about 115.5682274003.

Adding to 1543531 its reverse (1353451), we get a palindrome (2896982).

The spelling of 1543531 in words is "one million, five hundred forty-three thousand, five hundred thirty-one".