1242124009 has 4 divisors (see below), whose sum is σ = 1419570304. Its totient is φ = 1064677716.

The previous prime is 1242124007. The next prime is 1242124021. The reversal of 1242124009 is 9004212421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242124009 - 2¹ = 1242124007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242124007) 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, 88723137 + ... + 88723150.

It is an arithmetic number, because the mean of its divisors is an integer number (354892576).

Almost surely, 2^1242124009 is an apocalyptic number.

It is an amenable number.

1242124009 is a deficient number, since it is larger than the sum of its proper divisors (177446295).

1242124009 is an equidigital number, since it uses as much as digits as its factorization.

1242124009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177446294.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1242124009 is about 35243.7797206826. The cubic root of 1242124009 is about 1074.9501354913.

The spelling of 1242124009 in words is "one billion, two hundred forty-two million, one hundred twenty-four thousand, nine".