1266247249 has 2 divisors, whose sum is σ = 1266247250. Its totient is φ = 1266247248.

The previous prime is 1266247243. The next prime is 1266247349. The reversal of 1266247249 is 9427426621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 858490000 + 407757249 = 29300^2 + 20193^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266247249 - 2⁵ = 1266247217 is a prime.

It is a super-3 number, since 3×1266247249³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1266247243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633123624 + 633123625.

It is an arithmetic number, because the mean of its divisors is an integer number (633123625).

Almost surely, 2^1266247249 is an apocalyptic number.

It is an amenable number.

1266247249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266247249 is an equidigital number, since it uses as much as digits as its factorization.

1266247249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 1266247249 is about 35584.3680427235. The cubic root of 1266247249 is about 1081.8644204598.

The spelling of 1266247249 in words is "one billion, two hundred sixty-six million, two hundred forty-seven thousand, two hundred forty-nine".