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129466661 is a prime number
BaseRepresentation
bin1111011011110…
…00000100100101
3100000121120212112
413231320010211
5231120413121
620502530405
73131306552
oct755700445
9300546775
10129466661
1167098245
1237436a05
1320a8cabc
14132a1a29
15b57575b
hex7b78125

129466661 has 2 divisors, whose sum is σ = 129466662. Its totient is φ = 129466660.

The previous prime is 129466657. The next prime is 129466669. The reversal of 129466661 is 166664921.

129466661 is nontrivially palindromic in base 15.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80550625 + 48916036 = 8975^2 + 6994^2 .

It is an emirp because it is prime and its reverse (166664921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129466661 - 22 = 129466657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129466669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64733330 + 64733331.

It is an arithmetic number, because the mean of its divisors is an integer number (64733331).

Almost surely, 2129466661 is an apocalyptic number.

It is an amenable number.

129466661 is a deficient number, since it is larger than the sum of its proper divisors (1).

129466661 is an equidigital number, since it uses as much as digits as its factorization.

129466661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The square root of 129466661 is about 11378.3417508880. The cubic root of 129466661 is about 505.8859864353.

The spelling of 129466661 in words is "one hundred twenty-nine million, four hundred sixty-six thousand, six hundred sixty-one".