71045399 has 4 divisors (see below), whose sum is σ = 71081136. Its totient is φ = 71009664.

The previous prime is 71045357. The next prime is 71045449. The reversal of 71045399 is 99354017.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 71045399 - 2²⁴ = 54268183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71045309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14699 + ... + 18924.

It is an arithmetic number, because the mean of its divisors is an integer number (17770284).

Almost surely, 2^71045399 is an apocalyptic number.

71045399 is a deficient number, since it is larger than the sum of its proper divisors (35737).

71045399 is a wasteful number, since it uses less digits than its factorization.

71045399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35736.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 71045399 is about 8428.8432776983. The cubic root of 71045399 is about 414.1700138771.

The spelling of 71045399 in words is "seventy-one million, forty-five thousand, three hundred ninety-nine".