1242525533 has 4 divisors (see below), whose sum is σ = 1254827868. Its totient is φ = 1230223200.

The previous prime is 1242525443. The next prime is 1242525589. The reversal of 1242525533 is 3355252421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3355252421 = 101 ⋅33220321.

It can be written as a sum of positive squares in 2 ways, for example, as 554932249 + 687593284 = 23557^2 + 26222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242525533 - 2¹⁶ = 1242459997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242525533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242525593) 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, 6151016 + ... + 6151217.

It is an arithmetic number, because the mean of its divisors is an integer number (313706967).

Almost surely, 2^1242525533 is an apocalyptic number.

It is an amenable number.

1242525533 is a deficient number, since it is larger than the sum of its proper divisors (12302335).

1242525533 is a wasteful number, since it uses less digits than its factorization.

1242525533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12302334.

The product of its digits is 36000, while the sum is 32.

The square root of 1242525533 is about 35249.4756414900. The cubic root of 1242525533 is about 1075.0659510287.

Adding to 1242525533 its reverse (3355252421), we get a palindrome (4597777954).

The spelling of 1242525533 in words is "one billion, two hundred forty-two million, five hundred twenty-five thousand, five hundred thirty-three".