71951251 has 4 divisors (see below), whose sum is σ = 71988192. Its totient is φ = 71914312.

The previous prime is 71951239. The next prime is 71951261. The reversal of 71951251 is 15215917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15215917 = 37 ⋅411241.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71951251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71951221) 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, 15376 + ... + 19501.

It is an arithmetic number, because the mean of its divisors is an integer number (17997048).

Almost surely, 2^71951251 is an apocalyptic number.

71951251 is a deficient number, since it is larger than the sum of its proper divisors (36941).

71951251 is a wasteful number, since it uses less digits than its factorization.

71951251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36940.

The product of its digits is 3150, while the sum is 31.

The square root of 71951251 is about 8482.4083254698. The cubic root of 71951251 is about 415.9228526657.

The spelling of 71951251 in words is "seventy-one million, nine hundred fifty-one thousand, two hundred fifty-one".