1537543 has 4 divisors (see below), whose sum is σ = 1757200. Its totient is φ = 1317888.

The previous prime is 1537517. The next prime is 1537559. The reversal of 1537543 is 3457351.

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 1537543 - 2⁹ = 1537031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1537513) 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, 109818 + ... + 109831.

It is an arithmetic number, because the mean of its divisors is an integer number (439300).

2^1537543 is an apocalyptic number.

1537543 is a deficient number, since it is larger than the sum of its proper divisors (219657).

1537543 is an equidigital number, since it uses as much as digits as its factorization.

1537543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219656.

The product of its digits is 6300, while the sum is 28.

The square root of 1537543 is about 1239.9770159160. The cubic root of 1537543 is about 115.4185879566.

It can be divided in two parts, 1537 and 543, that added together give a triangular number (2080 = T₆₄).

The spelling of 1537543 in words is "one million, five hundred thirty-seven thousand, five hundred forty-three".