1188145780441 has 3 divisors (see below), whose sum is σ = 1188146870463. Its totient is φ = 1188144690420.

The previous prime is 1188145780411. The next prime is 1188145780463. The reversal of 1188145780441 is 1440875418811.

The square root of 1188145780441 is 1090021.

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., 324695972041 + 863449808400 = 569821^2 + 929220^2 .

It is not a de Polignac number, because 1188145780441 - 2⁹ = 1188145779929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1188145780411) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 545011 + ... + 1635031.

It is an arithmetic number, because the mean of its divisors is an integer number (396048956821).

Almost surely, 2^{1188145780441} is an apocalyptic number.

1188145780441 is the 1090021-st square number.

1188145780441 is the 545011-st centered octagonal number.

It is an amenable number.

1188145780441 is a deficient number, since it is larger than the sum of its proper divisors (1090022).

1188145780441 is an frugal number, since it uses more digits than its factorization.

1188145780441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180042 (or 1090021 counting only the distinct ones).

The product of its (nonzero) digits is 1146880, while the sum is 52.

The spelling of 1188145780441 in words is "one trillion, one hundred eighty-eight billion, one hundred forty-five million, seven hundred eighty thousand, four hundred forty-one".