126699649 has 2 divisors, whose sum is σ = 126699650. Its totient is φ = 126699648.

The previous prime is 126699577. The next prime is 126699673. The reversal of 126699649 is 946996621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97377424 + 29322225 = 9868^2 + 5415^2 .

It is a cyclic number.

It is not a de Polignac number, because 126699649 - 2¹¹ = 126697601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 126699596 and 126699605.

It is not a weakly prime, because it can be changed into another prime (126699679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63349824 + 63349825.

It is an arithmetic number, because the mean of its divisors is an integer number (63349825).

Almost surely, 2^126699649 is an apocalyptic number.

It is an amenable number.

126699649 is a deficient number, since it is larger than the sum of its proper divisors (1).

126699649 is an equidigital number, since it uses as much as digits as its factorization.

126699649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 52.

The square root of 126699649 is about 11256.0938606605. The cubic root of 126699649 is about 502.2560042469.

The spelling of 126699649 in words is "one hundred twenty-six million, six hundred ninety-nine thousand, six hundred forty-nine".