129322381 has 2 divisors, whose sum is σ = 129322382. Its totient is φ = 129322380.

The previous prime is 129322357. The next prime is 129322387. The reversal of 129322381 is 183223921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111640356 + 17682025 = 10566^2 + 4205^2 .

It is an emirp because it is prime and its reverse (183223921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129322381 - 2⁷ = 129322253 is a prime.

It is a super-2 number, since 2×129322381² = 33448556455018322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129322387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64661190 + 64661191.

It is an arithmetic number, because the mean of its divisors is an integer number (64661191).

Almost surely, 2^129322381 is an apocalyptic number.

It is an amenable number.

129322381 is a deficient number, since it is larger than the sum of its proper divisors (1).

129322381 is an equidigital number, since it uses as much as digits as its factorization.

129322381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 129322381 is about 11371.9998680971. Note that the first 3 decimals coincide. The cubic root of 129322381 is about 505.6979937380.

The spelling of 129322381 in words is "one hundred twenty-nine million, three hundred twenty-two thousand, three hundred eighty-one".