71361591 has 24 divisors (see below), whose sum is σ = 111081600. Its totient is φ = 40631472.

The previous prime is 71361583. The next prime is 71361601. The reversal of 71361591 is 19516317.

It is a happy number.

It is not a de Polignac number, because 71361591 - 2³ = 71361583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71361551) 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 23 ways as a sum of consecutive naturals, for example, 50310 + ... + 51708.

It is an arithmetic number, because the mean of its divisors is an integer number (4628400).

Almost surely, 2^71361591 is an apocalyptic number.

71361591 is a deficient number, since it is larger than the sum of its proper divisors (39720009).

71361591 is a wasteful number, since it uses less digits than its factorization.

71361591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763 (or 1756 counting only the distinct ones).

The product of its digits is 5670, while the sum is 33.

The square root of 71361591 is about 8447.5790022941. The cubic root of 71361591 is about 414.7835344709.

The spelling of 71361591 in words is "seventy-one million, three hundred sixty-one thousand, five hundred ninety-one".