1128944461 has 2 divisors, whose sum is σ = 1128944462. Its totient is φ = 1128944460.

The previous prime is 1128944459. The next prime is 1128944473. The reversal of 1128944461 is 1644498211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1089330025 + 39614436 = 33005^2 + 6294^2 .

It is an emirp because it is prime and its reverse (1644498211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1128944461 - 2¹ = 1128944459 is a prime.

It is a super-4 number, since 4×1128944461⁴ (a number of 37 digits) contains 4444 as substring.

Together with 1128944459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128944431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564472230 + 564472231.

It is an arithmetic number, because the mean of its divisors is an integer number (564472231).

Almost surely, 2^1128944461 is an apocalyptic number.

It is an amenable number.

1128944461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128944461 is an equidigital number, since it uses as much as digits as its factorization.

1128944461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 1128944461 is about 33599.7687640853. The cubic root of 1128944461 is about 1041.2560210002.

The spelling of 1128944461 in words is "one billion, one hundred twenty-eight million, nine hundred forty-four thousand, four hundred sixty-one".