74271521 has 8 divisors (see below), whose sum is σ = 78835680. Its totient is φ = 69729088.

The previous prime is 74271517. The next prime is 74271529. The reversal of 74271521 is 12517247.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74271521 - 2² = 74271517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74271529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1910 + ... + 12336.

It is an arithmetic number, because the mean of its divisors is an integer number (9854460).

Almost surely, 2^74271521 is an apocalyptic number.

It is an amenable number.

74271521 is a deficient number, since it is larger than the sum of its proper divisors (4564159).

74271521 is a wasteful number, since it uses less digits than its factorization.

74271521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10863.

The product of its digits is 3920, while the sum is 29.

The square root of 74271521 is about 8618.0926544103. The cubic root of 74271521 is about 420.3465035466.

Adding to 74271521 its reverse (12517247), we get a palindrome (86788768).

The spelling of 74271521 in words is "seventy-four million, two hundred seventy-one thousand, five hundred twenty-one".