72291 has 4 divisors (see below), whose sum is σ = 96392. Its totient is φ = 48192.

The previous prime is 72287. The next prime is 72307. The reversal of 72291 is 19227.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72291 - 2² = 72287 is a prime.

It is a super-3 number, since 3×72291³ = 1133375843214513, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72211) 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, 12046 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (24098).

2⁷²²⁹¹ is an apocalyptic number.

72291 is a deficient number, since it is larger than the sum of its proper divisors (24101).

72291 is a wasteful number, since it uses less digits than its factorization.

72291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24100.

The product of its digits is 252, while the sum is 21.

The square root of 72291 is about 268.8698569940. The cubic root of 72291 is about 41.6576478258.

It can be divided in two parts, 72 and 291, that added together give a palindrome (363).

The spelling of 72291 in words is "seventy-two thousand, two hundred ninety-one".