1273659649 has 2 divisors, whose sum is σ = 1273659650. Its totient is φ = 1273659648.

The previous prime is 1273659631. The next prime is 1273659677. The reversal of 1273659649 is 9469563721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191630400 + 82029249 = 34520^2 + 9057^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273659649 - 2⁵ = 1273659617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1273659596 and 1273659605.

It is not a weakly prime, because it can be changed into another prime (1273659619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636829824 + 636829825.

It is an arithmetic number, because the mean of its divisors is an integer number (636829825).

Almost surely, 2^1273659649 is an apocalyptic number.

It is an amenable number.

1273659649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273659649 is an equidigital number, since it uses as much as digits as its factorization.

1273659649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 52.

The square root of 1273659649 is about 35688.3685393435. The cubic root of 1273659649 is about 1083.9713325230.

The spelling of 1273659649 in words is "one billion, two hundred seventy-three million, six hundred fifty-nine thousand, six hundred forty-nine".