1428170793721 has 35 divisors (see below), whose sum is σ = 1725603697811. Its totient is φ = 1181934449976.

The previous prime is 1428170793719. The next prime is 1428170793769. The reversal of 1428170793721 is 1273970718241.

The square root of 1428170793721 is 1195061.

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

It can be written as a sum of positive squares in 3 ways, for example, as 609978182121 + 818192611600 = 781011^2 + 904540^2 .

It is not a de Polignac number, because 1428170793721 - 2¹ = 1428170793719 is a prime.

It is a super-2 number, since 2×1428170793721² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1428170797721) by changing a digit.

It is a polite number, since it can be written in 34 ways as a sum of consecutive naturals, for example, 49247268735 + ... + 49247268763.

Almost surely, 2^{1428170793721} is an apocalyptic number.

1428170793721 is the 1195061-st square number.

1428170793721 is the 597531-st centered octagonal number.

It is an amenable number.

1428170793721 is a deficient number, since it is larger than the sum of its proper divisors (297432904090).

1428170793721 is an frugal number, since it uses more digits than its factorization.

1428170793721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 52.

The spelling of 1428170793721 in words is "one trillion, four hundred twenty-eight billion, one hundred seventy million, seven hundred ninety-three thousand, seven hundred twenty-one".