1242253013 has 2 divisors, whose sum is σ = 1242253014. Its totient is φ = 1242253012.

The previous prime is 1242253009. The next prime is 1242253039. The reversal of 1242253013 is 3103522421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 979877809 + 262375204 = 31303^2 + 16198^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242253013 - 2² = 1242253009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242253013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242258013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621126506 + 621126507.

It is an arithmetic number, because the mean of its divisors is an integer number (621126507).

Almost surely, 2^1242253013 is an apocalyptic number.

It is an amenable number.

1242253013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242253013 is an equidigital number, since it uses as much as digits as its factorization.

1242253013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1242253013 is about 35245.6098400921. The cubic root of 1242253013 is about 1074.9873481114.

Adding to 1242253013 its reverse (3103522421), we get a palindrome (4345775434).

The spelling of 1242253013 in words is "one billion, two hundred forty-two million, two hundred fifty-three thousand, thirteen".