1155394961449 has 27 divisors (see below), whose sum is σ = 1252001354863. Its totient is φ = 1066018683392.

The previous prime is 1155394961419. The next prime is 1155394961507. The reversal of 1155394961449 is 9441694935511.

The square root of 1155394961449 is 1074893.

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

It can be written as a sum of positive squares in 13 ways, for example, as 69355856025 + 1086039105424 = 263355^2 + 1042132^2 .

It is not a de Polignac number, because 1155394961449 - 2²⁹ = 1154858090537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155394961419) 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, 968477997 + ... + 968479189.

Almost surely, 2^{1155394961449} is an apocalyptic number.

1155394961449 is the 1074893-rd square number.

1155394961449 is the 537447-th centered octagonal number.

It is an amenable number.

1155394961449 is a deficient number, since it is larger than the sum of its proper divisors (96606393414).

1155394961449 is an frugal number, since it uses more digits than its factorization.

1155394961449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526 (or 1263 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 61.

The spelling of 1155394961449 in words is "one trillion, one hundred fifty-five billion, three hundred ninety-four million, nine hundred sixty-one thousand, four hundred forty-nine".