129181951 has 2 divisors, whose sum is σ = 129181952. Its totient is φ = 129181950.

The previous prime is 129181891. The next prime is 129182023. The reversal of 129181951 is 159181921.

It is a weak prime.

It is an emirp because it is prime and its reverse (159181921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129181951 - 2⁹ = 129181439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129181951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129181751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64590975 + 64590976.

It is an arithmetic number, because the mean of its divisors is an integer number (64590976).

Almost surely, 2^129181951 is an apocalyptic number.

129181951 is a deficient number, since it is larger than the sum of its proper divisors (1).

129181951 is an equidigital number, since it uses as much as digits as its factorization.

129181951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 37.

The square root of 129181951 is about 11365.8238152806. The cubic root of 129181951 is about 505.5148831552.

The spelling of 129181951 in words is "one hundred twenty-nine million, one hundred eighty-one thousand, nine hundred fifty-one".