71597 has 2 divisors, whose sum is σ = 71598. Its totient is φ = 71596.

The previous prime is 71593. The next prime is 71633. The reversal of 71597 is 79517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70756 + 841 = 266^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 71597 - 2² = 71593 is a prime.

It is a super-2 number, since 2×71597² = 10252260818, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35798 + 35799.

It is an arithmetic number, because the mean of its divisors is an integer number (35799).

2⁷¹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

71597 is a deficient number, since it is larger than the sum of its proper divisors (1).

71597 is an equidigital number, since it uses as much as digits as its factorization.

71597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2205, while the sum is 29.

The square root of 71597 is about 267.5761573833. The cubic root of 71597 is about 41.5239132514.

The spelling of 71597 in words is "seventy-one thousand, five hundred ninety-seven".