1242115949 has 2 divisors, whose sum is σ = 1242115950. Its totient is φ = 1242115948.

The previous prime is 1242115933. The next prime is 1242115957. The reversal of 1242115949 is 9495112421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 838507849 + 403608100 = 28957^2 + 20090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242115949 - 2⁴ = 1242115933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242115969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621057974 + 621057975.

It is an arithmetic number, because the mean of its divisors is an integer number (621057975).

Almost surely, 2^1242115949 is an apocalyptic number.

It is an amenable number.

1242115949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242115949 is an equidigital number, since it uses as much as digits as its factorization.

1242115949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 1242115949 is about 35243.6653740782. The cubic root of 1242115949 is about 1074.9478104103.

The spelling of 1242115949 in words is "one billion, two hundred forty-two million, one hundred fifteen thousand, nine hundred forty-nine".