72151251 has 8 divisors (see below), whose sum is σ = 98248704. Its totient is φ = 47077320.

The previous prime is 72151249. The next prime is 72151271. The reversal of 72151251 is 15215127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72151251 - 2¹ = 72151249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72151201) 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 7 ways as a sum of consecutive naturals, for example, 255715 + ... + 255996.

It is an arithmetic number, because the mean of its divisors is an integer number (12281088).

Almost surely, 2^72151251 is an apocalyptic number.

72151251 is a deficient number, since it is larger than the sum of its proper divisors (26097453).

72151251 is a wasteful number, since it uses less digits than its factorization.

72151251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511761.

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

The square root of 72151251 is about 8494.1892491279. The cubic root of 72151251 is about 416.3078708238.

Adding to 72151251 its reverse (15215127), we get a palindrome (87366378).

The spelling of 72151251 in words is "seventy-two million, one hundred fifty-one thousand, two hundred fifty-one".