1242105437 has 2 divisors, whose sum is σ = 1242105438. Its totient is φ = 1242105436.

The previous prime is 1242105433. The next prime is 1242105457. The reversal of 1242105437 is 7345012421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 934769476 + 307335961 = 30574^2 + 17531^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242105437 - 2² = 1242105433 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242105433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621052718 + 621052719.

It is an arithmetic number, because the mean of its divisors is an integer number (621052719).

Almost surely, 2^1242105437 is an apocalyptic number.

It is an amenable number.

1242105437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242105437 is an equidigital number, since it uses as much as digits as its factorization.

1242105437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 1242105437 is about 35243.5162405796. The cubic root of 1242105437 is about 1074.9447779818.

Adding to 1242105437 its reverse (7345012421), we get a palindrome (8587117858).

The spelling of 1242105437 in words is "one billion, two hundred forty-two million, one hundred five thousand, four hundred thirty-seven".