1243902361 has 9 divisors (see below), whose sum is σ = 1347444189. Its totient is φ = 1147794336.

The previous prime is 1243902349. The next prime is 1243902383. The reversal of 1243902361 is 1632093421.

The square root of 1243902361 is 35269.

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 94692361 + 1149210000 = 9731^2 + 33900^2 .

It is not a de Polignac number, because 1243902361 - 2¹⁵ = 1243869593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243902391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 457141 + ... + 459853.

It is an arithmetic number, because the mean of its divisors is an integer number (149716021).

Almost surely, 2^1243902361 is an apocalyptic number.

1243902361 is the 35269-th square number.

1243902361 is the 17635-th centered octagonal number.

It is an amenable number.

1243902361 is a deficient number, since it is larger than the sum of its proper divisors (103541828).

1243902361 is an frugal number, since it uses more digits than its factorization.

1243902361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5452 (or 2726 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The cubic root of 1243902361 is about 1075.4628937813.

Adding to 1243902361 its reverse (1632093421), we get a palindrome (2875995782).

The spelling of 1243902361 in words is "one billion, two hundred forty-three million, nine hundred two thousand, three hundred sixty-one".