71615 has 4 divisors (see below), whose sum is σ = 85944. Its totient is φ = 57288.

The previous prime is 71597. The next prime is 71633. The reversal of 71615 is 51617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51617 = 71 ⋅727.

It is an interprime number because it is at equal distance from previous prime (71597) and next prime (71633).

It is a cyclic number.

It is not a de Polignac number, because 71615 - 2⁶ = 71551 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13 and base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7157 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (21486).

2⁷¹⁶¹⁵ is an apocalyptic number.

71615 is a deficient number, since it is larger than the sum of its proper divisors (14329).

71615 is a wasteful number, since it uses less digits than its factorization.

71615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14328.

The product of its digits is 210, while the sum is 20.

The square root of 71615 is about 267.6097905533. The cubic root of 71615 is about 41.5273927632.

It can be divided in two parts, 71 and 615, that added together give a palindrome (686).

The spelling of 71615 in words is "seventy-one thousand, six hundred fifteen".