1242250013 has 4 divisors (see below), whose sum is σ = 1242328668. Its totient is φ = 1242171360.

The previous prime is 1242250007. The next prime is 1242250043. The reversal of 1242250013 is 3100522421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 115842169 + 1126407844 = 10763^2 + 33562^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242250013 - 2¹⁸ = 1241987869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242250043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6506 + ... + 50267.

It is an arithmetic number, because the mean of its divisors is an integer number (310582167).

Almost surely, 2^1242250013 is an apocalyptic number.

It is an amenable number.

1242250013 is a deficient number, since it is larger than the sum of its proper divisors (78655).

1242250013 is an equidigital number, since it uses as much as digits as its factorization.

1242250013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78654.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1242250013 is about 35245.5672815746. The cubic root of 1242250013 is about 1074.9864827577.

Adding to 1242250013 its reverse (3100522421), we get a palindrome (4342772434).

The spelling of 1242250013 in words is "one billion, two hundred forty-two million, two hundred fifty thousand, thirteen".