129454781 has 2 divisors, whose sum is σ = 129454782. Its totient is φ = 129454780.

The previous prime is 129454777. The next prime is 129454817. The reversal of 129454781 is 187454921.

Together with next prime (129454817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72829156 + 56625625 = 8534^2 + 7525^2 .

It is a cyclic number.

It is not a de Polignac number, because 129454781 - 2² = 129454777 is a prime.

It is a super-2 number, since 2×129454781² = 33517080647515922, which contains 22 as substring.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129454181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64727390 + 64727391.

It is an arithmetic number, because the mean of its divisors is an integer number (64727391).

Almost surely, 2^129454781 is an apocalyptic number.

It is an amenable number.

129454781 is a deficient number, since it is larger than the sum of its proper divisors (1).

129454781 is an equidigital number, since it uses as much as digits as its factorization.

129454781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 41.

The square root of 129454781 is about 11377.8196944757. The cubic root of 129454781 is about 505.8705124147.

The spelling of 129454781 in words is "one hundred twenty-nine million, four hundred fifty-four thousand, seven hundred eighty-one".