71397157 has 16 divisors (see below), whose sum is σ = 79119040. Its totient is φ = 64012032.

The previous prime is 71397107. The next prime is 71397167. The reversal of 71397157 is 75179317.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71397157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71397107) 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, 188194 + ... + 188572.

It is an arithmetic number, because the mean of its divisors is an integer number (4944940).

Almost surely, 2^71397157 is an apocalyptic number.

It is an amenable number.

71397157 is a deficient number, since it is larger than the sum of its proper divisors (7721883).

71397157 is a wasteful number, since it uses less digits than its factorization.

71397157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772.

The product of its digits is 46305, while the sum is 40.

The square root of 71397157 is about 8449.6838402392. The cubic root of 71397157 is about 414.8524312022.

The spelling of 71397157 in words is "seventy-one million, three hundred ninety-seven thousand, one hundred fifty-seven".