1297978525 has 24 divisors (see below), whose sum is σ = 1673504000. Its totient is φ = 997574400.

The previous prime is 1297978519. The next prime is 1297978541. The reversal of 1297978525 is 5258797921.

It is a happy number.

It is not a de Polignac number, because 1297978525 - 2⁷ = 1297978397 is a prime.

It is a super-2 number, since 2×1297978525² = 3369496502722351250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101701 + ... + 113749.

Almost surely, 2^1297978525 is an apocalyptic number.

It is an amenable number.

1297978525 is a deficient number, since it is larger than the sum of its proper divisors (375525475).

1297978525 is a wasteful number, since it uses less digits than its factorization.

1297978525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12229 (or 12224 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 55.

The square root of 1297978525 is about 36027.4690340579. The cubic root of 1297978525 is about 1090.8268912759.

The spelling of 1297978525 in words is "one billion, two hundred ninety-seven million, nine hundred seventy-eight thousand, five hundred twenty-five".