129287131 has 2 divisors, whose sum is σ = 129287132. Its totient is φ = 129287130.

The previous prime is 129287107. The next prime is 129287141. The reversal of 129287131 is 131782921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129287131 - 2⁷ = 129287003 is a prime.

It is a super-2 number, since 2×129287131² = 33430324484422322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129287141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64643565 + 64643566.

It is an arithmetic number, because the mean of its divisors is an integer number (64643566).

Almost surely, 2^129287131 is an apocalyptic number.

129287131 is a deficient number, since it is larger than the sum of its proper divisors (1).

129287131 is an equidigital number, since it uses as much as digits as its factorization.

129287131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 129287131 is about 11370.4499031481. The cubic root of 129287131 is about 505.6520427484.

The spelling of 129287131 in words is "one hundred twenty-nine million, two hundred eighty-seven thousand, one hundred thirty-one".