1253323121 has 4 divisors (see below), whose sum is σ = 1254953700. Its totient is φ = 1251692544.

The previous prime is 1253323117. The next prime is 1253323133. The reversal of 1253323121 is 1213233521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 873852721 + 379470400 = 29561^2 + 19480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253323121 - 2² = 1253323117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253323321) 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, 814136 + ... + 815673.

It is an arithmetic number, because the mean of its divisors is an integer number (313738425).

Almost surely, 2^1253323121 is an apocalyptic number.

It is an amenable number.

1253323121 is a deficient number, since it is larger than the sum of its proper divisors (1630579).

1253323121 is an equidigital number, since it uses as much as digits as its factorization.

1253323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630578.

The product of its digits is 1080, while the sum is 23.

The square root of 1253323121 is about 35402.3038939558. The cubic root of 1253323121 is about 1078.1710932906.

Adding to 1253323121 its reverse (1213233521), we get a palindrome (2466556642).

The spelling of 1253323121 in words is "one billion, two hundred fifty-three million, three hundred twenty-three thousand, one hundred twenty-one".