126649997 has 2 divisors, whose sum is σ = 126649998. Its totient is φ = 126649996.

The previous prime is 126649993. The next prime is 126650009. The reversal of 126649997 is 799946621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 62425801 = 8014^2 + 7901^2 .

It is an emirp because it is prime and its reverse (799946621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126649997 - 2² = 126649993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126649993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63324998 + 63324999.

It is an arithmetic number, because the mean of its divisors is an integer number (63324999).

Almost surely, 2^126649997 is an apocalyptic number.

It is an amenable number.

126649997 is a deficient number, since it is larger than the sum of its proper divisors (1).

126649997 is an equidigital number, since it uses as much as digits as its factorization.

126649997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 53.

The square root of 126649997 is about 11253.8880836802. Note that the first 3 decimals coincide. The cubic root of 126649997 is about 502.1903864028.

The spelling of 126649997 in words is "one hundred twenty-six million, six hundred forty-nine thousand, nine hundred ninety-seven".