1291680525 has 24 divisors (see below), whose sum is σ = 2151183744. Its totient is φ = 683862400.

The previous prime is 1291680517. The next prime is 1291680539. The reversal of 1291680525 is 5250861921.

It is not a de Polignac number, because 1291680525 - 2³ = 1291680517 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52581 + ... + 73130.

It is an arithmetic number, because the mean of its divisors is an integer number (89632656).

Almost surely, 2^1291680525 is an apocalyptic number.

1291680525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1291680525 is a deficient number, since it is larger than the sum of its proper divisors (859503219).

1291680525 is a wasteful number, since it uses less digits than its factorization.

1291680525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125861 (or 125856 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 1291680525 is about 35939.9572203418. The cubic root of 1291680525 is about 1089.0597410058.

The spelling of 1291680525 in words is "one billion, two hundred ninety-one million, six hundred eighty thousand, five hundred twenty-five".