71440251 has 8 divisors (see below), whose sum is σ = 95329104. Its totient is φ = 47589120.

The previous prime is 71440249. The next prime is 71440261. The reversal of 71440251 is 15204417.

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

It is not a de Polignac number, because 71440251 - 2¹ = 71440249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71440261) 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, 4666 + ... + 12831.

It is an arithmetic number, because the mean of its divisors is an integer number (11916138).

Almost surely, 2^71440251 is an apocalyptic number.

71440251 is a deficient number, since it is larger than the sum of its proper divisors (23888853).

71440251 is a wasteful number, since it uses less digits than its factorization.

71440251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18861.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 71440251 is about 8452.2334918056. The cubic root of 71440251 is about 414.9358801599.

Adding to 71440251 its reverse (15204417), we get a palindrome (86644668).

The spelling of 71440251 in words is "seventy-one million, four hundred forty thousand, two hundred fifty-one".