71157 has 4 divisors (see below), whose sum is σ = 94880. Its totient is φ = 47436.

The previous prime is 71153. The next prime is 71161. The reversal of 71157 is 75117.

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.

It is an interprime number because it is at equal distance from previous prime (71153) and next prime (71161).

It is not a de Polignac number, because 71157 - 2² = 71153 is a prime.

It is a D-number.

It is a Duffinian number.

71157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71153) 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, 11857 + ... + 11862.

It is an arithmetic number, because the mean of its divisors is an integer number (23720).

2⁷¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

71157 is a deficient number, since it is larger than the sum of its proper divisors (23723).

71157 is a wasteful number, since it uses less digits than its factorization.

71157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23722.

The product of its digits is 245, while the sum is 21.

The square root of 71157 is about 266.7526944569. The cubic root of 71157 is about 41.4386765452.

The spelling of 71157 in words is "seventy-one thousand, one hundred fifty-seven".