121532543 has 4 divisors (see below), whose sum is σ = 132580968. Its totient is φ = 110484120.

The previous prime is 121532539. The next prime is 121532599. The reversal of 121532543 is 345235121.

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 121532543 - 2² = 121532539 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121532503) 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, 5524196 + ... + 5524217.

It is an arithmetic number, because the mean of its divisors is an integer number (33145242).

Almost surely, 2^121532543 is an apocalyptic number.

121532543 is a deficient number, since it is larger than the sum of its proper divisors (11048425).

121532543 is a wasteful number, since it uses less digits than its factorization.

121532543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11048424.

The product of its digits is 3600, while the sum is 26.

The square root of 121532543 is about 11024.1799241486. The cubic root of 121532543 is about 495.3333033944. Note that the first 4 decimals are identical.

Adding to 121532543 its reverse (345235121), we get a palindrome (466767664).

The spelling of 121532543 in words is "one hundred twenty-one million, five hundred thirty-two thousand, five hundred forty-three".