71161597 has 4 divisors (see below), whose sum is σ = 76635580. Its totient is φ = 65687616.

The previous prime is 71161591. The next prime is 71161613. The reversal of 71161597 is 79516117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79516117 = 811 ⋅98047.

It can be written as a sum of positive squares in 2 ways, for example, as 9523396 + 61638201 = 3086^2 + 7851^2 .

It is a cyclic number.

It is not a de Polignac number, because 71161597 - 2¹⁵ = 71128829 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 (71161591) 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, 2736972 + ... + 2736997.

It is an arithmetic number, because the mean of its divisors is an integer number (19158895).

Almost surely, 2^71161597 is an apocalyptic number.

It is an amenable number.

71161597 is a deficient number, since it is larger than the sum of its proper divisors (5473983).

71161597 is a wasteful number, since it uses less digits than its factorization.

71161597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5473982.

The product of its digits is 13230, while the sum is 37.

The square root of 71161597 is about 8435.7333409728. The cubic root of 71161597 is about 414.3956888891.

The spelling of 71161597 in words is "seventy-one million, one hundred sixty-one thousand, five hundred ninety-seven".