71933993 has 2 divisors, whose sum is σ = 71933994. Its totient is φ = 71933992.

The previous prime is 71933971. The next prime is 71934001. The reversal of 71933993 is 39933917.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54361129 + 17572864 = 7373^2 + 4192^2 .

It is an emirp because it is prime and its reverse (39933917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71933993 - 2⁶ = 71933929 is a prime.

It is not a weakly prime, because it can be changed into another prime (71933963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35966996 + 35966997.

It is an arithmetic number, because the mean of its divisors is an integer number (35966997).

Almost surely, 2^71933993 is an apocalyptic number.

It is an amenable number.

71933993 is a deficient number, since it is larger than the sum of its proper divisors (1).

71933993 is an equidigital number, since it uses as much as digits as its factorization.

71933993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137781, while the sum is 44.

The square root of 71933993 is about 8481.3909826160. The cubic root of 71933993 is about 415.8895960256.

The spelling of 71933993 in words is "seventy-one million, nine hundred thirty-three thousand, nine hundred ninety-three".