72511251 has 16 divisors (see below), whose sum is σ = 97899648. Its totient is φ = 47736000.

The previous prime is 72511213. The next prime is 72511253. The reversal of 72511251 is 15211527.

It is not a de Polignac number, because 72511251 - 2¹³ = 72503059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72511253) 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 15 ways as a sum of consecutive naturals, for example, 120351 + ... + 120951.

It is an arithmetic number, because the mean of its divisors is an integer number (6118728).

Almost surely, 2^72511251 is an apocalyptic number.

72511251 is a deficient number, since it is larger than the sum of its proper divisors (25388397).

72511251 is a wasteful number, since it uses less digits than its factorization.

72511251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042.

The product of its digits is 700, while the sum is 24.

The square root of 72511251 is about 8515.3538388020. The cubic root of 72511251 is about 416.9991143757. Note that the first 3 decimals are identical.

Adding to 72511251 its reverse (15211527), we get a palindrome (87722778).

The spelling of 72511251 in words is "seventy-two million, five hundred eleven thousand, two hundred fifty-one".