71161391 has 4 divisors (see below), whose sum is σ = 81327312. Its totient is φ = 60995472.

The previous prime is 71161381. The next prime is 71161429. The reversal of 71161391 is 19316117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19316117 = 29 ⋅666073.

It is a cyclic number.

It is not a de Polignac number, because 71161391 - 2¹⁸ = 70899247 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 (71161381) 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, 5082950 + ... + 5082963.

It is an arithmetic number, because the mean of its divisors is an integer number (20331828).

Almost surely, 2^71161391 is an apocalyptic number.

71161391 is a deficient number, since it is larger than the sum of its proper divisors (10165921).

71161391 is a wasteful number, since it uses less digits than its factorization.

71161391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10165920.

The product of its digits is 1134, while the sum is 29.

The square root of 71161391 is about 8435.7211310000. The cubic root of 71161391 is about 414.3952890217.

The spelling of 71161391 in words is "seventy-one million, one hundred sixty-one thousand, three hundred ninety-one".