71329987 has 2 divisors, whose sum is σ = 71329988. Its totient is φ = 71329986.

The previous prime is 71329981. The next prime is 71330003. The reversal of 71329987 is 78992317.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71329987 - 2⁷ = 71329859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71329981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35664993 + 35664994.

It is an arithmetic number, because the mean of its divisors is an integer number (35664994).

Almost surely, 2^71329987 is an apocalyptic number.

71329987 is a deficient number, since it is larger than the sum of its proper divisors (1).

71329987 is an equidigital number, since it uses as much as digits as its factorization.

71329987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 71329987 is about 8445.7082000268. The cubic root of 71329987 is about 414.7222935228.

The spelling of 71329987 in words is "seventy-one million, three hundred twenty-nine thousand, nine hundred eighty-seven".