1297427521 has 8 divisors (see below), whose sum is σ = 1470768320. Its totient is φ = 1134592272.

The previous prime is 1297427497. The next prime is 1297427557. The reversal of 1297427521 is 1257247921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1297427521 - 2⁹ = 1297427009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297427561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2626125 + ... + 2626618.

It is an arithmetic number, because the mean of its divisors is an integer number (183846040).

Almost surely, 2^1297427521 is an apocalyptic number.

It is an amenable number.

1297427521 is a deficient number, since it is larger than the sum of its proper divisors (173340799).

1297427521 is a wasteful number, since it uses less digits than its factorization.

1297427521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252775.

The product of its digits is 70560, while the sum is 40.

The square root of 1297427521 is about 36019.8212238762. The cubic root of 1297427521 is about 1090.6725140297.

The spelling of 1297427521 in words is "one billion, two hundred ninety-seven million, four hundred twenty-seven thousand, five hundred twenty-one".