1297156648 has 8 divisors (see below), whose sum is σ = 2432168730. Its totient is φ = 648578320.

The previous prime is 1297156633. The next prime is 1297156673. The reversal of 1297156648 is 8466517921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1160219844 + 136936804 = 34062^2 + 11702^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81072283 + ... + 81072298.

Almost surely, 2^1297156648 is an apocalyptic number.

It is an amenable number.

1297156648 is a deficient number, since it is larger than the sum of its proper divisors (1135012082).

1297156648 is a wasteful number, since it uses less digits than its factorization.

1297156648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162144587 (or 162144583 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The square root of 1297156648 is about 36016.0609728493. The cubic root of 1297156648 is about 1090.5966063089.

The spelling of 1297156648 in words is "one billion, two hundred ninety-seven million, one hundred fifty-six thousand, six hundred forty-eight".