129935261 has 2 divisors, whose sum is σ = 129935262. Its totient is φ = 129935260.

The previous prime is 129935237. The next prime is 129935263. The reversal of 129935261 is 162539921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118679236 + 11256025 = 10894^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 129935261 - 2²² = 125740957 is a prime.

It is a super-2 number, since 2×129935261² = 33766344102276242, which contains 22 as substring.

Together with 129935263, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 129935261 parts by 16120 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129935263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64967630 + 64967631.

It is an arithmetic number, because the mean of its divisors is an integer number (64967631).

Almost surely, 2^129935261 is an apocalyptic number.

It is an amenable number.

129935261 is a deficient number, since it is larger than the sum of its proper divisors (1).

129935261 is an equidigital number, since it uses as much as digits as its factorization.

129935261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 129935261 is about 11398.9149044986. The cubic root of 129935261 is about 506.4955970158.

The spelling of 129935261 in words is "one hundred twenty-nine million, nine hundred thirty-five thousand, two hundred sixty-one".