871780157 has 2 divisors, whose sum is σ = 871780158. Its totient is φ = 871780156.

The previous prime is 871780153. The next prime is 871780159. The reversal of 871780157 is 751087178.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 867066916 + 4713241 = 29446^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 871780157 - 2² = 871780153 is a prime.

Together with 871780159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871780153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435890078 + 435890079.

It is an arithmetic number, because the mean of its divisors is an integer number (435890079).

Almost surely, 2^871780157 is an apocalyptic number.

It is an amenable number.

871780157 is a deficient number, since it is larger than the sum of its proper divisors (1).

871780157 is an equidigital number, since it uses as much as digits as its factorization.

871780157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109760, while the sum is 44.

The square root of 871780157 is about 29525.9234741269. The cubic root of 871780157 is about 955.2909421199.

The spelling of 871780157 in words is "eight hundred seventy-one million, seven hundred eighty thousand, one hundred fifty-seven".