1572493428081 has 9 divisors (see below), whose sum is σ = 2271384830091. Its totient is φ = 1048326444072.

The previous prime is 1572493428073. The next prime is 1572493428113. The reversal of 1572493428081 is 1808243942751.

The square root of 1572493428081 is 1253991.

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

1572493428081 is a `hidden beast` number, since 1 + 5 + 72 + 493 + 4 + 2 + 8 + 0 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 252099389025 + 1320394039056 = 502095^2 + 1149084^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1572493428081 - 2³ = 1572493428073 is a prime.

It is a super-2 number, since 2×1572493428081² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1572493428061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3552975 + ... + 3970971.

Almost surely, 2^{1572493428081} is an apocalyptic number.

1572493428081 is the 1253991-st square number.

1572493428081 is the 626996-th centered octagonal number.

It is an amenable number.

1572493428081 is a deficient number, since it is larger than the sum of its proper divisors (698891402010).

1572493428081 is an frugal number, since it uses more digits than its factorization.

1572493428081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836000 (or 418000 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 1572493428081 in words is "one trillion, five hundred seventy-two billion, four hundred ninety-three million, four hundred twenty-eight thousand, eighty-one".