129541421 has 2 divisors, whose sum is σ = 129541422. Its totient is φ = 129541420.

The previous prime is 129541393. The next prime is 129541457. The reversal of 129541421 is 124145921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87796900 + 41744521 = 9370^2 + 6461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129541421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129541121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64770710 + 64770711.

It is an arithmetic number, because the mean of its divisors is an integer number (64770711).

Almost surely, 2^129541421 is an apocalyptic number.

It is an amenable number.

129541421 is a deficient number, since it is larger than the sum of its proper divisors (1).

129541421 is an equidigital number, since it uses as much as digits as its factorization.

129541421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 129541421 is about 11381.6264654925. The cubic root of 129541421 is about 505.9833416378.

The spelling of 129541421 in words is "one hundred twenty-nine million, five hundred forty-one thousand, four hundred twenty-one".