71611491 has 24 divisors (see below), whose sum is σ = 111391680. Its totient is φ = 40802832.

The previous prime is 71611451. The next prime is 71611567. The reversal of 71611491 is 19411617.

It is not a de Polignac number, because 71611491 - 2¹¹ = 71609443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71611451) 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, 90600 + ... + 91386.

It is an arithmetic number, because the mean of its divisors is an integer number (4641320).

Almost surely, 2^71611491 is an apocalyptic number.

71611491 is a deficient number, since it is larger than the sum of its proper divisors (39780189).

71611491 is a wasteful number, since it uses less digits than its factorization.

71611491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 1416 counting only the distinct ones).

The product of its digits is 1512, while the sum is 30.

The square root of 71611491 is about 8462.3572956949. The cubic root of 71611491 is about 415.2671449745.

The spelling of 71611491 in words is "seventy-one million, six hundred eleven thousand, four hundred ninety-one".