71705091 has 4 divisors (see below), whose sum is σ = 95606792. Its totient is φ = 47803392.

The previous prime is 71705063. The next prime is 71705113. The reversal of 71705091 is 19050717.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 71705091 - 2⁵ = 71705059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71705021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11950846 + ... + 11950851.

It is an arithmetic number, because the mean of its divisors is an integer number (23901698).

Almost surely, 2^71705091 is an apocalyptic number.

71705091 is a deficient number, since it is larger than the sum of its proper divisors (23901701).

71705091 is a wasteful number, since it uses less digits than its factorization.

71705091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23901700.

The product of its (nonzero) digits is 2205, while the sum is 30.

The square root of 71705091 is about 8467.8858636616. The cubic root of 71705091 is about 415.4479915673.

The spelling of 71705091 in words is "seventy-one million, seven hundred five thousand, ninety-one".