814717157 has 4 divisors (see below), whose sum is σ = 825877740. Its totient is φ = 803556576.

The previous prime is 814717151. The next prime is 814717181. The reversal of 814717157 is 751717418.

814717157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 542004961 + 272712196 = 23281^2 + 16514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-814717157 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 (814717151) 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, 5580182 + ... + 5580327.

It is an arithmetic number, because the mean of its divisors is an integer number (206469435).

Almost surely, 2^814717157 is an apocalyptic number.

It is an amenable number.

814717157 is a deficient number, since it is larger than the sum of its proper divisors (11160583).

814717157 is a wasteful number, since it uses less digits than its factorization.

814717157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11160582.

The product of its digits is 54880, while the sum is 41.

The square root of 814717157 is about 28543.2506382858. The cubic root of 814717157 is about 933.9757940406.

The spelling of 814717157 in words is "eight hundred fourteen million, seven hundred seventeen thousand, one hundred fifty-seven".