129850961 has 2 divisors, whose sum is σ = 129850962. Its totient is φ = 129850960.

The previous prime is 129850949. The next prime is 129851003. The reversal of 129850961 is 169058921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112678225 + 17172736 = 10615^2 + 4144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129850961 is a prime.

It is a super-2 number, since 2×129850961² = 33722544145247042, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (129855961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64925480 + 64925481.

It is an arithmetic number, because the mean of its divisors is an integer number (64925481).

Almost surely, 2^129850961 is an apocalyptic number.

It is an amenable number.

129850961 is a deficient number, since it is larger than the sum of its proper divisors (1).

129850961 is an equidigital number, since it uses as much as digits as its factorization.

129850961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 129850961 is about 11395.2165841637. The cubic root of 129850961 is about 506.3860377997.

The spelling of 129850961 in words is "one hundred twenty-nine million, eight hundred fifty thousand, nine hundred sixty-one".