1144689661 has 8 divisors (see below), whose sum is σ = 1166265144. Its totient is φ = 1123315200.

The previous prime is 1144689649. The next prime is 1144689677. The reversal of 1144689661 is 1669864411.

It can be written as a sum of positive squares in 4 ways, for example, as 459244900 + 685444761 = 21430^2 + 26181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1144689661 - 2²¹ = 1142592509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144689631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38736 + ... + 61561.

It is an arithmetic number, because the mean of its divisors is an integer number (145783143).

Almost surely, 2^1144689661 is an apocalyptic number.

It is an amenable number.

1144689661 is a deficient number, since it is larger than the sum of its proper divisors (21575483).

1144689661 is a wasteful number, since it uses less digits than its factorization.

1144689661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100511.

The product of its digits is 248832, while the sum is 46.

The square root of 1144689661 is about 33833.2626419623. The cubic root of 1144689661 is about 1046.0744307475.

The spelling of 1144689661 in words is "one billion, one hundred forty-four million, six hundred eighty-nine thousand, six hundred sixty-one".