1243338121 has 9 divisors (see below), whose sum is σ = 1279192341. Its totient is φ = 1208464992.

The previous prime is 1243338113. The next prime is 1243338127. The reversal of 1243338121 is 1218333421.

The square root of 1243338121 is 35261.

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

It can be written as a sum of positive squares in 4 ways, for example, as 163558521 + 1079779600 = 12789^2 + 32860^2 .

It is not a de Polignac number, because 1243338121 - 2³ = 1243338113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243338121.

It is not an unprimeable number, because it can be changed into a prime (1243338127) 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, 1304181 + ... + 1305133.

Almost surely, 2^1243338121 is an apocalyptic number.

1243338121 is the 35261-st square number.

1243338121 is the 17631-st centered octagonal number.

It is an amenable number.

1243338121 is a deficient number, since it is larger than the sum of its proper divisors (35854220).

1243338121 is an frugal number, since it uses more digits than its factorization.

1243338121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980 (or 990 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The cubic root of 1243338121 is about 1075.3002575012.

The spelling of 1243338121 in words is "one billion, two hundred forty-three million, three hundred thirty-eight thousand, one hundred twenty-one".