129927139 has 2 divisors, whose sum is σ = 129927140. Its totient is φ = 129927138.

The previous prime is 129927131. The next prime is 129927143. The reversal of 129927139 is 931729921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129927139 - 2³ = 129927131 is a prime.

It is a super-2 number, since 2×129927139² = 33762122897450642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129927095 and 129927104.

It is not a weakly prime, because it can be changed into another prime (129927131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64963569 + 64963570.

It is an arithmetic number, because the mean of its divisors is an integer number (64963570).

Almost surely, 2^129927139 is an apocalyptic number.

129927139 is a deficient number, since it is larger than the sum of its proper divisors (1).

129927139 is an equidigital number, since it uses as much as digits as its factorization.

129927139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 129927139 is about 11398.5586369506. The cubic root of 129927139 is about 506.4850434449.

The spelling of 129927139 in words is "one hundred twenty-nine million, nine hundred twenty-seven thousand, one hundred thirty-nine".