71157121 has 16 divisors (see below), whose sum is σ = 88888320. Its totient is φ = 55549440.

The previous prime is 71157113. The next prime is 71157133. The reversal of 71157121 is 12175117.

It is a cyclic number.

It is not a de Polignac number, because 71157121 - 2³ = 71157113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71157221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5956 + ... + 13333.

It is an arithmetic number, because the mean of its divisors is an integer number (5555520).

Almost surely, 2^71157121 is an apocalyptic number.

It is an amenable number.

71157121 is a deficient number, since it is larger than the sum of its proper divisors (17731199).

71157121 is a wasteful number, since it uses less digits than its factorization.

71157121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19344.

The product of its digits is 490, while the sum is 25.

The square root of 71157121 is about 8435.4680368074. The cubic root of 71157121 is about 414.3870003357.

The spelling of 71157121 in words is "seventy-one million, one hundred fifty-seven thousand, one hundred twenty-one".