71631279 has 6 divisors (see below), whose sum is σ = 103467416. Its totient is φ = 47754180.

The previous prime is 71631277. The next prime is 71631281. The reversal of 71631279 is 97213617.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (71631277) and next prime (71631281).

It is not a de Polignac number, because 71631279 - 2¹ = 71631277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71631271) 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 5 ways as a sum of consecutive naturals, for example, 3979507 + ... + 3979524.

Almost surely, 2^71631279 is an apocalyptic number.

71631279 is a deficient number, since it is larger than the sum of its proper divisors (31836137).

71631279 is a wasteful number, since it uses less digits than its factorization.

71631279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7959037 (or 7959034 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 71631279 is about 8463.5263927042. The cubic root of 71631279 is about 415.3053909291.

The spelling of 71631279 in words is "seventy-one million, six hundred thirty-one thousand, two hundred seventy-nine".