67439129 has 2 divisors, whose sum is σ = 67439130. Its totient is φ = 67439128.

The previous prime is 67439117. The next prime is 67439143. The reversal of 67439129 is 92193476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40896025 + 26543104 = 6395^2 + 5152^2 .

It is a cyclic number.

It is not a de Polignac number, because 67439129 - 2²⁴ = 50661913 is a prime.

It is a super-2 number, since 2×67439129² = 9096072240557282, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3976187 and since 67439129 and 3976187 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (67439329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33719564 + 33719565.

It is an arithmetic number, because the mean of its divisors is an integer number (33719565).

Almost surely, 2^67439129 is an apocalyptic number.

It is an amenable number.

67439129 is a deficient number, since it is larger than the sum of its proper divisors (1).

67439129 is an equidigital number, since it uses as much as digits as its factorization.

67439129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 67439129 is about 8212.1330359414. The cubic root of 67439129 is about 407.0402135950.

The spelling of 67439129 in words is "sixty-seven million, four hundred thirty-nine thousand, one hundred twenty-nine".