71239951 has 2 divisors, whose sum is σ = 71239952. Its totient is φ = 71239950.

The previous prime is 71239943. The next prime is 71239957. The reversal of 71239951 is 15993217.

It is a strong prime.

It is an emirp because it is prime and its reverse (15993217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71239951 - 2³ = 71239943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71239951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71239957) 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 as a sum of consecutive naturals, namely, 35619975 + 35619976.

It is an arithmetic number, because the mean of its divisors is an integer number (35619976).

Almost surely, 2^71239951 is an apocalyptic number.

71239951 is a deficient number, since it is larger than the sum of its proper divisors (1).

71239951 is an equidigital number, since it uses as much as digits as its factorization.

71239951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 37.

The square root of 71239951 is about 8440.3762356900. The cubic root of 71239951 is about 414.5477261833.

The spelling of 71239951 in words is "seventy-one million, two hundred thirty-nine thousand, nine hundred fifty-one".