1570412491921 has 81 divisors (see below), whose sum is σ = 2028044577681. Its totient is φ = 1211937015744.

The previous prime is 1570412491867. The next prime is 1570412491993. The reversal of 1570412491921 is 1291942140751.

It is a happy number.

The square root of 1570412491921 is 1253161.

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

It can be written as a sum of positive squares in 4 ways, for example, as 40144530321 + 1530267961600 = 200361^2 + 1237040^2 .

It is not a de Polignac number, because 1570412491921 - 2¹⁵ = 1570412459153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1570412492921) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 5359769451 + ... + 5359769743.

Almost surely, 2^{1570412491921} is an apocalyptic number.

1570412491921 is the 1253161-st square number.

1570412491921 is the 626581-st centered octagonal number.

It is an amenable number.

1570412491921 is a deficient number, since it is larger than the sum of its proper divisors (457632085760).

1570412491921 is an frugal number, since it uses more digits than its factorization.

1570412491921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 1570412491921 in words is "one trillion, five hundred seventy billion, four hundred twelve million, four hundred ninety-one thousand, nine hundred twenty-one".