71443973 has 2 divisors, whose sum is σ = 71443974. Its totient is φ = 71443972.

The previous prime is 71443961. The next prime is 71443987. The reversal of 71443973 is 37934417.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64272289 + 7171684 = 8017^2 + 2678^2 .

It is a cyclic number.

It is not a de Polignac number, because 71443973 - 2⁸ = 71443717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71443903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35721986 + 35721987.

It is an arithmetic number, because the mean of its divisors is an integer number (35721987).

Almost surely, 2^71443973 is an apocalyptic number.

It is an amenable number.

71443973 is a deficient number, since it is larger than the sum of its proper divisors (1).

71443973 is an equidigital number, since it uses as much as digits as its factorization.

71443973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 71443973 is about 8452.4536674270. The cubic root of 71443973 is about 414.9430860161.

The spelling of 71443973 in words is "seventy-one million, four hundred forty-three thousand, nine hundred seventy-three".