1253345521 has 4 divisors (see below), whose sum is σ = 1260850752. Its totient is φ = 1245840292.

The previous prime is 1253345497. The next prime is 1253345539. The reversal of 1253345521 is 1255433521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1253345521 - 2²³ = 1244956913 is a prime.

It is a super-2 number, since 2×1253345521² = 3141749990021522882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253345551) 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, 3752365 + ... + 3752698.

It is an arithmetic number, because the mean of its divisors is an integer number (315212688).

Almost surely, 2^1253345521 is an apocalyptic number.

It is an amenable number.

1253345521 is a deficient number, since it is larger than the sum of its proper divisors (7505231).

1253345521 is an equidigital number, since it uses as much as digits as its factorization.

1253345521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7505230.

The product of its digits is 18000, while the sum is 31.

The square root of 1253345521 is about 35402.6202561336. The cubic root of 1253345521 is about 1078.1775164516.

The spelling of 1253345521 in words is "one billion, two hundred fifty-three million, three hundred forty-five thousand, five hundred twenty-one".