157247071 has 4 divisors (see below), whose sum is σ = 158638752. Its totient is φ = 155855392.

The previous prime is 157247063. The next prime is 157247099. The reversal of 157247071 is 170742751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170742751 = 1867 ⋅91453.

It is a cyclic number.

It is not a de Polignac number, because 157247071 - 2³ = 157247063 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 (157247171) 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, 695671 + ... + 695896.

It is an arithmetic number, because the mean of its divisors is an integer number (39659688).

Almost surely, 2^157247071 is an apocalyptic number.

157247071 is a deficient number, since it is larger than the sum of its proper divisors (1391681).

157247071 is a wasteful number, since it uses less digits than its factorization.

157247071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391680.

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

The square root of 157247071 is about 12539.8194165626. The cubic root of 157247071 is about 539.7519105017.

The spelling of 157247071 in words is "one hundred fifty-seven million, two hundred forty-seven thousand, seventy-one".