71391029 has 4 divisors (see below), whose sum is σ = 71412684. Its totient is φ = 71369376.

The previous prime is 71391017. The next prime is 71391031. The reversal of 71391029 is 92019317.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15171025 + 56220004 = 3895^2 + 7498^2 .

It is a cyclic number.

It is not a de Polignac number, because 71391029 - 2⁴ = 71391013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71390986 and 71391004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71391049) 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, 4742 + ... + 12855.

It is an arithmetic number, because the mean of its divisors is an integer number (17853171).

Almost surely, 2^71391029 is an apocalyptic number.

It is an amenable number.

71391029 is a deficient number, since it is larger than the sum of its proper divisors (21655).

71391029 is a wasteful number, since it uses less digits than its factorization.

71391029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21654.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 71391029 is about 8449.3212153403. The cubic root of 71391029 is about 414.8405619694.

The spelling of 71391029 in words is "seventy-one million, three hundred ninety-one thousand, twenty-nine".