71305979 has 2 divisors, whose sum is σ = 71305980. Its totient is φ = 71305978.

The previous prime is 71305967. The next prime is 71305981. The reversal of 71305979 is 97950317.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71305979 - 2¹² = 71301883 is a prime.

It is a super-2 number, since 2×71305979² = 10169085282296882, which contains 22 as substring.

Together with 71305981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71305579) 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 as a sum of consecutive naturals, namely, 35652989 + 35652990.

It is an arithmetic number, because the mean of its divisors is an integer number (35652990).

Almost surely, 2^71305979 is an apocalyptic number.

71305979 is a deficient number, since it is larger than the sum of its proper divisors (1).

71305979 is an equidigital number, since it uses as much as digits as its factorization.

71305979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 71305979 is about 8444.2867668027. The cubic root of 71305979 is about 414.6757597039.

The spelling of 71305979 in words is "seventy-one million, three hundred five thousand, nine hundred seventy-nine".