1387705204081 has 45 divisors (see below), whose sum is σ = 1678666864641. Its totient is φ = 1147060347552.

The previous prime is 1387705204069. The next prime is 1387705204097. The reversal of 1387705204081 is 1804025077831.

The square root of 1387705204081 is 1178009.

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 13933677681 + 1373771526400 = 118041^2 + 1172080^2 .

It is not a de Polignac number, because 1387705204081 - 2¹³ = 1387705195889 is a prime.

It is a super-2 number, since 2×1387705204081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387705204681) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1673950375 + ... + 1673951203.

Almost surely, 2^{1387705204081} is an apocalyptic number.

1387705204081 is the 1178009-th square number.

1387705204081 is the 589005-th centered octagonal number.

It is an amenable number.

1387705204081 is a deficient number, since it is larger than the sum of its proper divisors (290961660560).

1387705204081 is an frugal number, since it uses more digits than its factorization.

1387705204081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 1387705204081 in words is "one trillion, three hundred eighty-seven billion, seven hundred five million, two hundred four thousand, eighty-one".