71091993 has 12 divisors (see below), whose sum is σ = 110265360. Its totient is φ = 40623912.

The previous prime is 71091973. The next prime is 71092033. The reversal of 71091993 is 39919017.

It is not a de Polignac number, because 71091993 - 2⁶ = 71091929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71091973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241663 + ... + 241956.

It is an arithmetic number, because the mean of its divisors is an integer number (9188780).

Almost surely, 2^71091993 is an apocalyptic number.

It is an amenable number.

71091993 is a deficient number, since it is larger than the sum of its proper divisors (39173367).

71091993 is a wasteful number, since it uses less digits than its factorization.

71091993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483636 (or 483629 counting only the distinct ones).

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 71091993 is about 8431.6067863723. The cubic root of 71091993 is about 414.2605363726.

The spelling of 71091993 in words is "seventy-one million, ninety-one thousand, nine hundred ninety-three".