71090939 has 4 divisors (see below), whose sum is σ = 71165424. Its totient is φ = 71016456.

The previous prime is 71090933. The next prime is 71090963. The reversal of 71090939 is 93909017.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93909017 = 1693 ⋅55469.

It is a cyclic number.

It is not a de Polignac number, because 71090939 - 2⁸ = 71090683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71090933) 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, 35792 + ... + 37725.

It is an arithmetic number, because the mean of its divisors is an integer number (17791356).

Almost surely, 2^71090939 is an apocalyptic number.

71090939 is a deficient number, since it is larger than the sum of its proper divisors (74485).

71090939 is an equidigital number, since it uses as much as digits as its factorization.

71090939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74484.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 71090939 is about 8431.5442832259. The cubic root of 71090939 is about 414.2584891061.

The spelling of 71090939 in words is "seventy-one million, ninety thousand, nine hundred thirty-nine".