72523231 has 4 divisors (see below), whose sum is σ = 79116264. Its totient is φ = 65930200.

The previous prime is 72523201. The next prime is 72523267. The reversal of 72523231 is 13232527.

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 72523231 - 2⁹ = 72522719 is a prime.

It is a super-3 number, since 3×72523231³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72523196 and 72523205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72523201) 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, 3296500 + ... + 3296521.

It is an arithmetic number, because the mean of its divisors is an integer number (19779066).

Almost surely, 2^72523231 is an apocalyptic number.

72523231 is a deficient number, since it is larger than the sum of its proper divisors (6593033).

72523231 is a wasteful number, since it uses less digits than its factorization.

72523231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593032.

The product of its digits is 2520, while the sum is 25.

The square root of 72523231 is about 8516.0572449931. The cubic root of 72523231 is about 417.0220780502.

Adding to 72523231 its reverse (13232527), we get a palindrome (85755758).

The spelling of 72523231 in words is "seventy-two million, five hundred twenty-three thousand, two hundred thirty-one".