1125212257 has 8 divisors (see below), whose sum is σ = 1212105384. Its totient is φ = 1038367488.

The previous prime is 1125212251. The next prime is 1125212299. The reversal of 1125212257 is 7522125211.

It can be written as a sum of positive squares in 4 ways, for example, as 169104016 + 956108241 = 13004^2 + 30921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1125212257 - 2¹⁹ = 1124687969 is a prime.

It is a super-2 number, since 2×1125212257² = 2532205246606068098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125212251) 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, 46953 + ... + 66745.

It is an arithmetic number, because the mean of its divisors is an integer number (151513173).

Almost surely, 2^1125212257 is an apocalyptic number.

It is an amenable number.

1125212257 is a deficient number, since it is larger than the sum of its proper divisors (86893127).

1125212257 is a wasteful number, since it uses less digits than its factorization.

1125212257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24179.

The product of its digits is 2800, while the sum is 28.

The square root of 1125212257 is about 33544.1836538020. The cubic root of 1125212257 is about 1040.1073166501.

Adding to 1125212257 its reverse (7522125211), we get a palindrome (8647337468).

The spelling of 1125212257 in words is "one billion, one hundred twenty-five million, two hundred twelve thousand, two hundred fifty-seven".