71443987 has 2 divisors, whose sum is σ = 71443988. Its totient is φ = 71443986.

The previous prime is 71443973. The next prime is 71443997. The reversal of 71443987 is 78934417.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71443987 is a prime.

It is not a weakly prime, because it can be changed into another prime (71443997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35721993 + 35721994.

It is an arithmetic number, because the mean of its divisors is an integer number (35721994).

Almost surely, 2^71443987 is an apocalyptic number.

71443987 is a deficient number, since it is larger than the sum of its proper divisors (1).

71443987 is an equidigital number, since it uses as much as digits as its factorization.

71443987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 71443987 is about 8452.4544955888. The cubic root of 71443987 is about 414.9431131199.

The spelling of 71443987 in words is "seventy-one million, four hundred forty-three thousand, nine hundred eighty-seven".