72539251 has 4 divisors (see below), whose sum is σ = 72828504. Its totient is φ = 72250000.

The previous prime is 72539249. The next prime is 72539279. The reversal of 72539251 is 15293527.

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 72539251 - 2¹ = 72539249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72539651) 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, 144250 + ... + 144751.

It is an arithmetic number, because the mean of its divisors is an integer number (18207126).

Almost surely, 2^72539251 is an apocalyptic number.

72539251 is a deficient number, since it is larger than the sum of its proper divisors (289253).

72539251 is a wasteful number, since it uses less digits than its factorization.

72539251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289252.

The product of its digits is 18900, while the sum is 34.

The square root of 72539251 is about 8516.9977691673. The cubic root of 72539251 is about 417.0527817835.

It can be divided in two parts, 72539 and 251, that multiplied together give a square (18207289 = 4267²).

The spelling of 72539251 in words is "seventy-two million, five hundred thirty-nine thousand, two hundred fifty-one".