71732251 has 4 divisors (see below), whose sum is σ = 71749192. Its totient is φ = 71715312.

The previous prime is 71732249. The next prime is 71732257. The reversal of 71732251 is 15223717.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15223717 = 89 ⋅171053.

It is a cyclic number.

It is not a de Polignac number, because 71732251 - 2¹ = 71732249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71732257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4096 + ... + 12658.

It is an arithmetic number, because the mean of its divisors is an integer number (17937298).

Almost surely, 2^71732251 is an apocalyptic number.

71732251 is a deficient number, since it is larger than the sum of its proper divisors (16941).

71732251 is an equidigital number, since it uses as much as digits as its factorization.

71732251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16940.

The product of its digits is 2940, while the sum is 28.

The square root of 71732251 is about 8469.4894179047. The cubic root of 71732251 is about 415.5004385319.

Adding to 71732251 its reverse (15223717), we get a palindrome (86955968).

The spelling of 71732251 in words is "seventy-one million, seven hundred thirty-two thousand, two hundred fifty-one".