129642479 has 2 divisors, whose sum is σ = 129642480. Its totient is φ = 129642478.

The previous prime is 129642437. The next prime is 129642481. The reversal of 129642479 is 974246921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129642479 - 2⁸ = 129642223 is a prime.

It is a super-2 number, since 2×129642479² = 33614344722530882, which contains 22 as substring.

Together with 129642481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129642679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64821239 + 64821240.

It is an arithmetic number, because the mean of its divisors is an integer number (64821240).

Almost surely, 2^129642479 is an apocalyptic number.

129642479 is a deficient number, since it is larger than the sum of its proper divisors (1).

129642479 is an equidigital number, since it uses as much as digits as its factorization.

129642479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 129642479 is about 11386.0651236500. The cubic root of 129642479 is about 506.1148835367.

The spelling of 129642479 in words is "one hundred twenty-nine million, six hundred forty-two thousand, four hundred seventy-nine".