71631271 has 2 divisors, whose sum is σ = 71631272. Its totient is φ = 71631270.

The previous prime is 71631253. The next prime is 71631277. The reversal of 71631271 is 17213617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71631271 - 2⁵ = 71631239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71631277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35815635 + 35815636.

It is an arithmetic number, because the mean of its divisors is an integer number (35815636).

Almost surely, 2^71631271 is an apocalyptic number.

71631271 is a deficient number, since it is larger than the sum of its proper divisors (1).

71631271 is an equidigital number, since it uses as much as digits as its factorization.

71631271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 28.

The square root of 71631271 is about 8463.5259200879. The cubic root of 71631271 is about 415.3053754683.

Adding to 71631271 its reverse (17213617), we get a palindrome (88844888).

The spelling of 71631271 in words is "seventy-one million, six hundred thirty-one thousand, two hundred seventy-one".