1264020243 has 4 divisors (see below), whose sum is σ = 1685360328. Its totient is φ = 842680160.

The previous prime is 1264020229. The next prime is 1264020253. The reversal of 1264020243 is 3420204621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1264020243 - 2¹⁰ = 1264019219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1264020203) 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 3 ways as a sum of consecutive naturals, for example, 210670038 + ... + 210670043.

It is an arithmetic number, because the mean of its divisors is an integer number (421340082).

Almost surely, 2^1264020243 is an apocalyptic number.

1264020243 is a deficient number, since it is larger than the sum of its proper divisors (421340085).

1264020243 is an equidigital number, since it uses as much as digits as its factorization.

1264020243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421340084.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1264020243 is about 35553.0623575523. The cubic root of 1264020243 is about 1081.2298070649.

Adding to 1264020243 its reverse (3420204621), we get a palindrome (4684224864).

The spelling of 1264020243 in words is "one billion, two hundred sixty-four million, twenty thousand, two hundred forty-three".