1121512253 has 4 divisors (see below), whose sum is σ = 1187483580. Its totient is φ = 1055540928.

The previous prime is 1121512211. The next prime is 1121512289. The reversal of 1121512253 is 3522151211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3522151211 = 31 ⋅113617781.

It can be written as a sum of positive squares in 2 ways, for example, as 457831609 + 663680644 = 21397^2 + 25762^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121512253 - 2¹⁶ = 1121446717 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 (1121512153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32985638 + ... + 32985671.

It is an arithmetic number, because the mean of its divisors is an integer number (296870895).

Almost surely, 2^1121512253 is an apocalyptic number.

It is an amenable number.

1121512253 is a deficient number, since it is larger than the sum of its proper divisors (65971327).

1121512253 is an equidigital number, since it uses as much as digits as its factorization.

1121512253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65971326.

The product of its digits is 600, while the sum is 23.

The square root of 1121512253 is about 33488.9870405183. The cubic root of 1121512253 is about 1038.9660128271.

Adding to 1121512253 its reverse (3522151211), we get a palindrome (4643663464).

The spelling of 1121512253 in words is "one billion, one hundred twenty-one million, five hundred twelve thousand, two hundred fifty-three".