1267041649 has 2 divisors, whose sum is σ = 1267041650. Its totient is φ = 1267041648.

The previous prime is 1267041599. The next prime is 1267041673. The reversal of 1267041649 is 9461407621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034265600 + 232776049 = 32160^2 + 15257^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267041649 - 2⁷ = 1267041521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1267041689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633520824 + 633520825.

It is an arithmetic number, because the mean of its divisors is an integer number (633520825).

Almost surely, 2^1267041649 is an apocalyptic number.

It is an amenable number.

1267041649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267041649 is an equidigital number, since it uses as much as digits as its factorization.

1267041649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1267041649 is about 35595.5284972706. The cubic root of 1267041649 is about 1082.0906146813.

The spelling of 1267041649 in words is "one billion, two hundred sixty-seven million, forty-one thousand, six hundred forty-nine".