1387375381161 has 81 divisors (see below), whose sum is σ = 2562861008253. Its totient is φ = 720573139440.

The previous prime is 1387375381123. The next prime is 1387375381201. The reversal of 1387375381161 is 1611835737831.

The square root of 1387375381161 is 1177869.

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

1387375381161 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 37 + 538 + 11 + 61 = 666.

It is not a de Polignac number, because 1387375381161 - 2⁷ = 1387375381033 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1387375381098 and 1387375381107.

It is not an unprimeable number, because it can be changed into a prime (1387375381261) 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, 272085190 + ... + 272090288.

Almost surely, 2^{1387375381161} is an apocalyptic number.

1387375381161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1387375381161 is the 1177869-th square number.

1387375381161 is the 588935-th centered octagonal number.

It is an amenable number.

1387375381161 is a deficient number, since it is larger than the sum of its proper divisors (1175485627092).

1387375381161 is an frugal number, since it uses more digits than its factorization.

1387375381161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10240 (or 5120 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 1387375381161 in words is "one trillion, three hundred eighty-seven billion, three hundred seventy-five million, three hundred eighty-one thousand, one hundred sixty-one".