8729131 has 2 divisors, whose sum is σ = 8729132. Its totient is φ = 8729130.

The previous prime is 8729117. The next prime is 8729141. The reversal of 8729131 is 1319278.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8729131 - 2⁵ = 8729099 is a prime.

It is a super-2 number, since 2×8729131² = 152395456030322, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 8729093 and 8729102.

It is not a weakly prime, because it can be changed into another prime (8729141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4364565 + 4364566.

It is an arithmetic number, because the mean of its divisors is an integer number (4364566).

Almost surely, 2^8729131 is an apocalyptic number.

8729131 is a deficient number, since it is larger than the sum of its proper divisors (1).

8729131 is an equidigital number, since it uses as much as digits as its factorization.

8729131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 8729131 is about 2954.5102809095. The cubic root of 8729131 is about 205.9003115235.

The spelling of 8729131 in words is "eight million, seven hundred twenty-nine thousand, one hundred thirty-one".