1379231801649 has 27 divisors (see below), whose sum is σ = 2157331638657. Its totient is φ = 848729846016.

The previous prime is 1379231801621. The next prime is 1379231801659. The reversal of 1379231801649 is 9461081329731.

The square root of 1379231801649 is 1174407.

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

1379231801649 is a `hidden beast` number, since 1 + 379 + 2 + 31 + 80 + 164 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 22798886049 + 1356432915600 = 150993^2 + 1164660^2 .

It is not a de Polignac number, because 1379231801649 - 2¹⁷ = 1379231670577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1379231801595 and 1379231801604.

It is not an unprimeable number, because it can be changed into a prime (1379231801659) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 45786817 + ... + 45816929.

Almost surely, 2^{1379231801649} is an apocalyptic number.

1379231801649 is the 1174407-th square number.

1379231801649 is the 587204-th centered octagonal number.

It is an amenable number.

1379231801649 is a deficient number, since it is larger than the sum of its proper divisors (778099837008).

1379231801649 is an frugal number, since it uses more digits than its factorization.

1379231801649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60258 (or 30129 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 1379231801649 in words is "one trillion, three hundred seventy-nine billion, two hundred thirty-one million, eight hundred one thousand, six hundred forty-nine".