71320087 has 2 divisors, whose sum is σ = 71320088. Its totient is φ = 71320086.

The previous prime is 71320043. The next prime is 71320097. The reversal of 71320087 is 78002317.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78002317) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71320087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71320097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35660043 + 35660044.

It is an arithmetic number, because the mean of its divisors is an integer number (35660044).

Almost surely, 2^71320087 is an apocalyptic number.

71320087 is a deficient number, since it is larger than the sum of its proper divisors (1).

71320087 is an equidigital number, since it uses as much as digits as its factorization.

71320087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 71320087 is about 8445.1220831910. The cubic root of 71320087 is about 414.7031059841.

The spelling of 71320087 in words is "seventy-one million, three hundred twenty thousand, eighty-seven".