1242545125 has 8 divisors (see below), whose sum is σ = 1550696472. Its totient is φ = 994036000.

The previous prime is 1242545081. The next prime is 1242545167. The reversal of 1242545125 is 5215452421.

It can be written as a sum of positive squares in 4 ways, for example, as 243921924 + 998623201 = 15618^2 + 31601^2 .

It is not a de Polignac number, because 1242545125 - 2⁷ = 1242544997 is a prime.

It is a super-2 number, since 2×1242545125² = 3087836775322531250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4970056 + ... + 4970305.

It is an arithmetic number, because the mean of its divisors is an integer number (193837059).

Almost surely, 2^1242545125 is an apocalyptic number.

It is an amenable number.

1242545125 is a deficient number, since it is larger than the sum of its proper divisors (308151347).

1242545125 is an frugal number, since it uses more digits than its factorization.

1242545125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9940376 (or 9940366 counting only the distinct ones).

The product of its digits is 16000, while the sum is 31.

The square root of 1242545125 is about 35249.7535452377. The cubic root of 1242545125 is about 1075.0716015045.

Adding to 1242545125 its reverse (5215452421), we get a palindrome (6457997546).

The spelling of 1242545125 in words is "one billion, two hundred forty-two million, five hundred forty-five thousand, one hundred twenty-five".