1380533351521 has 9 divisors (see below), whose sum is σ = 1395027546681. Its totient is φ = 1366188252672.

The previous prime is 1380533351473. The next prime is 1380533351573. The reversal of 1380533351521 is 1251533350831.

The square root of 1380533351521 is 1174961.

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 84396641121 + 1296136710400 = 290511^2 + 1138480^2 .

It is not a de Polignac number, because 1380533351521 - 2²³ = 1380524962913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1380533351581) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 113965161 + ... + 113977273.

Almost surely, 2^{1380533351521} is an apocalyptic number.

1380533351521 is the 1174961-st square number.

1380533351521 is the 587481-st centered octagonal number.

It is an amenable number.

1380533351521 is a deficient number, since it is larger than the sum of its proper divisors (14494195160).

1380533351521 is an frugal number, since it uses more digits than its factorization.

1380533351521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24420 (or 12210 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 1380533351521 in words is "one trillion, three hundred eighty billion, five hundred thirty-three million, three hundred fifty-one thousand, five hundred twenty-one".