71157081 has 8 divisors (see below), whose sum is σ = 95082880. Its totient is φ = 47334672.

The previous prime is 71157077. The next prime is 71157083. The reversal of 71157081 is 18075117.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71157081 - 2² = 71157077 is a prime.

It is a super-2 number, since 2×71157081² = 10126660352881122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71157083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24226 + ... + 27003.

It is an arithmetic number, because the mean of its divisors is an integer number (11885360).

Almost surely, 2^71157081 is an apocalyptic number.

It is an amenable number.

71157081 is a deficient number, since it is larger than the sum of its proper divisors (23925799).

71157081 is a wasteful number, since it uses less digits than its factorization.

71157081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51695.

The product of its (nonzero) digits is 1960, while the sum is 30.

The square root of 71157081 is about 8435.4656658658. The cubic root of 71157081 is about 414.3869226884.

It can be divided in two parts, 7115 and 7081, that added together give a triangular number (14196 = T₁₆₈).

The spelling of 71157081 in words is "seventy-one million, one hundred fifty-seven thousand, eighty-one".