71281879 has 2 divisors, whose sum is σ = 71281880. Its totient is φ = 71281878.

The previous prime is 71281877. The next prime is 71281891. The reversal of 71281879 is 97818217.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71281879 - 2¹ = 71281877 is a prime.

It is a super-2 number, since 2×71281879² = 10162212547541282, which contains 22 as substring.

Together with 71281877, it forms a pair of twin primes.

It is equal to p_4188985 and since 71281879 and 4188985 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71281877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35640939 + 35640940.

It is an arithmetic number, because the mean of its divisors is an integer number (35640940).

Almost surely, 2^71281879 is an apocalyptic number.

71281879 is a deficient number, since it is larger than the sum of its proper divisors (1).

71281879 is an equidigital number, since it uses as much as digits as its factorization.

71281879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 43.

The square root of 71281879 is about 8442.8596458783. The cubic root of 71281879 is about 414.6290370586.

The spelling of 71281879 in words is "seventy-one million, two hundred eighty-one thousand, eight hundred seventy-nine".