71290243 has 4 divisors (see below), whose sum is σ = 71309560. Its totient is φ = 71270928.

The previous prime is 71290237. The next prime is 71290249. The reversal of 71290243 is 34209217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34209217 = 7 ⋅4887031.

It is an interprime number because it is at equal distance from previous prime (71290237) and next prime (71290249).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71290243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71290249) 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, 2205 + ... + 12142.

It is an arithmetic number, because the mean of its divisors is an integer number (17827390).

Almost surely, 2^71290243 is an apocalyptic number.

71290243 is a deficient number, since it is larger than the sum of its proper divisors (19317).

71290243 is a wasteful number, since it uses less digits than its factorization.

71290243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19316.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 71290243 is about 8443.3549611514. The cubic root of 71290243 is about 414.6452535299.

The spelling of 71290243 in words is "seventy-one million, two hundred ninety thousand, two hundred forty-three".