1189934087281 has 3 divisors (see below), whose sum is σ = 1189935178123. Its totient is φ = 1189932996440.

The previous prime is 1189934087273. The next prime is 1189934087371. The reversal of 1189934087281 is 1827804399811.

The square root of 1189934087281 is 1090841.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 988117509681 + 201816577600 = 994041^2 + 449240^2 .

It is not a de Polignac number, because 1189934087281 - 2³ = 1189934087273 is a prime.

It is a super-2 number, since 2×1189934087281² (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 (1189934087581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 545421 + ... + 1636261.

Almost surely, 2^{1189934087281} is an apocalyptic number.

1189934087281 is the 1090841-st square number.

1189934087281 is the 545421-st centered octagonal number.

It is an amenable number.

1189934087281 is a deficient number, since it is larger than the sum of its proper divisors (1090842).

1189934087281 is an frugal number, since it uses more digits than its factorization.

1189934087281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181682 (or 1090841 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 61.

The spelling of 1189934087281 in words is "one trillion, one hundred eighty-nine billion, nine hundred thirty-four million, eighty-seven thousand, two hundred eighty-one".