1242647125 has 8 divisors (see below), whose sum is σ = 1550823768. Its totient is φ = 994117600.

The previous prime is 1242647123. The next prime is 1242647149. The reversal of 1242647125 is 5217462421.

It can be written as a sum of positive squares in 4 ways, for example, as 5225796 + 1237421329 = 2286^2 + 35177^2 .

It is not a de Polignac number, because 1242647125 - 2¹ = 1242647123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242647123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4970464 + ... + 4970713.

It is an arithmetic number, because the mean of its divisors is an integer number (193852971).

Almost surely, 2^1242647125 is an apocalyptic number.

It is an amenable number.

1242647125 is a deficient number, since it is larger than the sum of its proper divisors (308176643).

1242647125 is an frugal number, since it uses more digits than its factorization.

1242647125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9941192 (or 9941182 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 1242647125 is about 35251.2003341730. The cubic root of 1242647125 is about 1075.1010180895.

The spelling of 1242647125 in words is "one billion, two hundred forty-two million, six hundred forty-seven thousand, one hundred twenty-five".