1267495249 has 2 divisors, whose sum is σ = 1267495250. Its totient is φ = 1267495248.

The previous prime is 1267495189. The next prime is 1267495261. The reversal of 1267495249 is 9425947621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034780224 + 232715025 = 32168^2 + 15255^2 .

It is an emirp because it is prime and its reverse (9425947621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1267495249 - 2¹³ = 1267487057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1267495949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633747624 + 633747625.

It is an arithmetic number, because the mean of its divisors is an integer number (633747625).

Almost surely, 2^1267495249 is an apocalyptic number.

It is an amenable number.

1267495249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267495249 is an equidigital number, since it uses as much as digits as its factorization.

1267495249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The square root of 1267495249 is about 35601.8995139304. The cubic root of 1267495249 is about 1082.2197284958.

The spelling of 1267495249 in words is "one billion, two hundred sixty-seven million, four hundred ninety-five thousand, two hundred forty-nine".