1428715793521 has 9 divisors (see below), whose sum is σ = 1431769090233. Its totient is φ = 1425669001860.

The previous prime is 1428715793489. The next prime is 1428715793537. The reversal of 1428715793521 is 1253975178241.

It is a happy number.

The square root of 1428715793521 is 1195289.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1428715793521 - 2⁵ = 1428715793489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428715790521) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 739882926 + ... + 739884856.

Almost surely, 2^{1428715793521} is an apocalyptic number.

1428715793521 is the 1195289-th square number.

1428715793521 is the 597645-th centered octagonal number.

It is an amenable number.

1428715793521 is a deficient number, since it is larger than the sum of its proper divisors (3053296712).

1428715793521 is an frugal number, since it uses more digits than its factorization.

1428715793521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100 (or 2550 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 55.

The spelling of 1428715793521 in words is "one trillion, four hundred twenty-eight billion, seven hundred fifteen million, seven hundred ninety-three thousand, five hundred twenty-one".