72513361 has 4 divisors (see below), whose sum is σ = 72540400. Its totient is φ = 72486324.

The previous prime is 72513359. The next prime is 72513401. The reversal of 72513361 is 16331527.

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 a cyclic number.

It is not a de Polignac number, because 72513361 - 2¹ = 72513359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72513761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8991 + ... + 15028.

It is an arithmetic number, because the mean of its divisors is an integer number (18135100).

Almost surely, 2^72513361 is an apocalyptic number.

It is an amenable number.

72513361 is a deficient number, since it is larger than the sum of its proper divisors (27039).

72513361 is a wasteful number, since it uses less digits than its factorization.

72513361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27038.

The product of its digits is 3780, while the sum is 28.

The square root of 72513361 is about 8515.4777317541. The cubic root of 72513361 is about 417.0031590795.

Adding to 72513361 its reverse (16331527), we get a palindrome (88844888).

The spelling of 72513361 in words is "seventy-two million, five hundred thirteen thousand, three hundred sixty-one".