1428653639169 has 21 divisors (see below), whose sum is σ = 2142048973683. Its totient is φ = 952414244712.

The previous prime is 1428653639141. The next prime is 1428653639183. The reversal of 1428653639169 is 9619363568241.

The square root of 1428653639169 is 1195263.

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

1428653639169 is a `hidden beast` number, since 1 + 4 + 2 + 8 + 6 + 536 + 3 + 91 + 6 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1406920982769 + 21732656400 = 1186137^2 + 147420^2 .

It is not a de Polignac number, because 1428653639169 - 2³⁵ = 1394293900801 is a prime.

It is a super-2 number, since 2×1428653639169² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1428653639269) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 32249967 + ... + 32294235.

Almost surely, 2^{1428653639169} is an apocalyptic number.

1428653639169 is the 1195263-rd square number.

1428653639169 is the 597632-nd centered octagonal number.

It is an amenable number.

1428653639169 is a deficient number, since it is larger than the sum of its proper divisors (713395334514).

1428653639169 is an frugal number, since it uses more digits than its factorization.

1428653639169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88556 (or 44272 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 63.

The spelling of 1428653639169 in words is "one trillion, four hundred twenty-eight billion, six hundred fifty-three million, six hundred thirty-nine thousand, one hundred sixty-nine".