71247157 has 4 divisors (see below), whose sum is σ = 71267616. Its totient is φ = 71226700.

The previous prime is 71247149. The next prime is 71247193. The reversal of 71247157 is 75174217.

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 a cyclic number.

It is not a de Polignac number, because 71247157 - 2³ = 71247149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71247107) 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, 3553 + ... + 12454.

It is an arithmetic number, because the mean of its divisors is an integer number (17816904).

Almost surely, 2^71247157 is an apocalyptic number.

It is an amenable number.

71247157 is a deficient number, since it is larger than the sum of its proper divisors (20459).

71247157 is a wasteful number, since it uses less digits than its factorization.

71247157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20458.

The product of its digits is 13720, while the sum is 34.

The square root of 71247157 is about 8440.8031016012. The cubic root of 71247157 is about 414.5617030327.

The spelling of 71247157 in words is "seventy-one million, two hundred forty-seven thousand, one hundred fifty-seven".