1242123937 has 2 divisors, whose sum is σ = 1242123938. Its totient is φ = 1242123936.

The previous prime is 1242123863. The next prime is 1242123941. The reversal of 1242123937 is 7393212421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 851705856 + 390418081 = 29184^2 + 19759^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242123937 - 2¹¹ = 1242121889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242123977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621061968 + 621061969.

It is an arithmetic number, because the mean of its divisors is an integer number (621061969).

Almost surely, 2^1242123937 is an apocalyptic number.

It is an amenable number.

1242123937 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242123937 is an equidigital number, since it uses as much as digits as its factorization.

1242123937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 1242123937 is about 35243.7786992258. The cubic root of 1242123937 is about 1074.9501147213.

The spelling of 1242123937 in words is "one billion, two hundred forty-two million, one hundred twenty-three thousand, nine hundred thirty-seven".