71248591 has 2 divisors, whose sum is σ = 71248592. Its totient is φ = 71248590.

The previous prime is 71248579. The next prime is 71248601. The reversal of 71248591 is 19584217.

It is a strong prime.

It is an emirp because it is prime and its reverse (19584217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71248591 - 2⁵ = 71248559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71248591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71248501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35624295 + 35624296.

It is an arithmetic number, because the mean of its divisors is an integer number (35624296).

Almost surely, 2^71248591 is an apocalyptic number.

71248591 is a deficient number, since it is larger than the sum of its proper divisors (1).

71248591 is an equidigital number, since it uses as much as digits as its factorization.

71248591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 71248591 is about 8440.8880456976. Note that the first 3 decimals coincide. The cubic root of 71248591 is about 414.5644843250.

The spelling of 71248591 in words is "seventy-one million, two hundred forty-eight thousand, five hundred ninety-one".