1291680527 has 4 divisors (see below), whose sum is σ = 1292103120. Its totient is φ = 1291257936.

The previous prime is 1291680517. The next prime is 1291680539. The reversal of 1291680527 is 7250861921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1291680527 - 2⁶ = 1291680463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291680517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206678 + ... + 212835.

It is an arithmetic number, because the mean of its divisors is an integer number (323025780).

Almost surely, 2^1291680527 is an apocalyptic number.

1291680527 is a deficient number, since it is larger than the sum of its proper divisors (422593).

1291680527 is an equidigital number, since it uses as much as digits as its factorization.

1291680527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422592.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 1291680527 is about 35939.9572481660. The cubic root of 1291680527 is about 1089.0597415679.

The spelling of 1291680527 in words is "one billion, two hundred ninety-one million, six hundred eighty thousand, five hundred twenty-seven".