129189481 has 2 divisors, whose sum is σ = 129189482. Its totient is φ = 129189480.

The previous prime is 129189457. The next prime is 129189499. The reversal of 129189481 is 184981921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105267600 + 23921881 = 10260^2 + 4891^2 .

It is a cyclic number.

It is not a de Polignac number, because 129189481 - 2²³ = 120800873 is a prime.

It is a super-2 number, since 2×129189481² = 33379844002098722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129189421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64594740 + 64594741.

It is an arithmetic number, because the mean of its divisors is an integer number (64594741).

Almost surely, 2^129189481 is an apocalyptic number.

It is an amenable number.

129189481 is a deficient number, since it is larger than the sum of its proper divisors (1).

129189481 is an equidigital number, since it uses as much as digits as its factorization.

129189481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 43.

The square root of 129189481 is about 11366.1550666881. The cubic root of 129189481 is about 505.5247050977.

The spelling of 129189481 in words is "one hundred twenty-nine million, one hundred eighty-nine thousand, four hundred eighty-one".