1228011849 has 9 divisors (see below), whose sum is σ = 1773946759. Its totient is φ = 818604480.

The previous prime is 1228011803. The next prime is 1228011859. The reversal of 1228011849 is 9481108221.

It is a happy number.

The square root of 1228011849 is 35043.

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

It can be written as a sum of positive squares in only one way, i.e., 622851849 + 605160000 = 24957^2 + 24600^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1228011849 - 2⁷ = 1228011721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228011859) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 99289 + ... + 110969.

Almost surely, 2^1228011849 is an apocalyptic number.

1228011849 is the 35043-rd square number.

1228011849 is the 17522-nd centered octagonal number.

It is an amenable number.

1228011849 is a deficient number, since it is larger than the sum of its proper divisors (545934910).

1228011849 is an frugal number, since it uses more digits than its factorization.

1228011849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23368 (or 11684 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The cubic root of 1228011849 is about 1070.8636719140.

Multiplying 1228011849 by its sum of digits (36), we get a square (44208426564 = 210258²).

Multiplying 1228011849 by its product of nonzero digits (9216), we get a square (11317357200384 = 3364128²).

The spelling of 1228011849 in words is "one billion, two hundred twenty-eight million, eleven thousand, eight hundred forty-nine".