74521543 has 4 divisors (see below), whose sum is σ = 75784680. Its totient is φ = 73258408.

The previous prime is 74521453. The next prime is 74521549. The reversal of 74521543 is 34512547.

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 74521543 - 2¹⁷ = 74390471 is a prime.

It is a super-2 number, since 2×74521543² = 11106920742201698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74521549) 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, 631480 + ... + 631597.

It is an arithmetic number, because the mean of its divisors is an integer number (18946170).

Almost surely, 2^74521543 is an apocalyptic number.

74521543 is a deficient number, since it is larger than the sum of its proper divisors (1263137).

74521543 is a wasteful number, since it uses less digits than its factorization.

74521543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263136.

The product of its digits is 16800, while the sum is 31.

The square root of 74521543 is about 8632.5861130950. The cubic root of 74521543 is about 420.8176494324.

The spelling of 74521543 in words is "seventy-four million, five hundred twenty-one thousand, five hundred forty-three".