72423331 has 2 divisors, whose sum is σ = 72423332. Its totient is φ = 72423330.

The previous prime is 72423313. The next prime is 72423361. The reversal of 72423331 is 13332427.

Together with previous prime (72423313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13332427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72423331 - 2⁷ = 72423203 is a prime.

It is a super-2 number, since 2×72423331² = 10490277746271122, which contains 22 as substring.

It is equal to p_4252219 and since 72423331 and 4252219 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 72423296 and 72423305.

It is not a weakly prime, because it can be changed into another prime (72423361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36211665 + 36211666.

It is an arithmetic number, because the mean of its divisors is an integer number (36211666).

Almost surely, 2^72423331 is an apocalyptic number.

72423331 is a deficient number, since it is larger than the sum of its proper divisors (1).

72423331 is an equidigital number, since it uses as much as digits as its factorization.

72423331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 25.

The square root of 72423331 is about 8510.1898333703. The cubic root of 72423331 is about 416.8305088631.

Adding to 72423331 its reverse (13332427), we get a palindrome (85755758).

The spelling of 72423331 in words is "seventy-two million, four hundred twenty-three thousand, three hundred thirty-one".