71501 has 4 divisors (see below), whose sum is σ = 72192. Its totient is φ = 70812.

The previous prime is 71483. The next prime is 71503. The reversal of 71501 is 10517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10517 = 13 ⋅809.

It is a cyclic number.

It is not a de Polignac number, because 71501 - 2⁶ = 71437 is a prime.

It is a super-2 number, since 2×71501² = 10224786002, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71503) 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, 155 + ... + 408.

It is an arithmetic number, because the mean of its divisors is an integer number (18048).

2⁷¹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

71501 is a deficient number, since it is larger than the sum of its proper divisors (691).

71501 is a wasteful number, since it uses less digits than its factorization.

71501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 35, while the sum is 14.

The square root of 71501 is about 267.3967090299. The cubic root of 71501 is about 41.5053459993.

The spelling of 71501 in words is "seventy-one thousand, five hundred one".