72841521 has 4 divisors (see below), whose sum is σ = 97122032. Its totient is φ = 48561012.

The previous prime is 72841519. The next prime is 72841523. The reversal of 72841521 is 12514827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (72841519) and next prime (72841523).

It is not a de Polignac number, because 72841521 - 2¹ = 72841519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72841523) 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, 12140251 + ... + 12140256.

It is an arithmetic number, because the mean of its divisors is an integer number (24280508).

Almost surely, 2^72841521 is an apocalyptic number.

It is an amenable number.

72841521 is a deficient number, since it is larger than the sum of its proper divisors (24280511).

72841521 is a wasteful number, since it uses less digits than its factorization.

72841521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24280510.

The product of its digits is 4480, while the sum is 30.

The square root of 72841521 is about 8534.7244243736. The cubic root of 72841521 is about 417.6312633026.

The spelling of 72841521 in words is "seventy-two million, eight hundred forty-one thousand, five hundred twenty-one".