1253405603 has 4 divisors (see below), whose sum is σ = 1259968128. Its totient is φ = 1246843080.

The previous prime is 1253405537. The next prime is 1253405611. The reversal of 1253405603 is 3065043521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3065043521 = 521 ⋅5883001.

It is a cyclic number.

It is not a de Polignac number, because 1253405603 - 2⁸ = 1253405347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253408603) 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, 3280976 + ... + 3281357.

It is an arithmetic number, because the mean of its divisors is an integer number (314992032).

Almost surely, 2^1253405603 is an apocalyptic number.

1253405603 is a deficient number, since it is larger than the sum of its proper divisors (6562525).

1253405603 is an equidigital number, since it uses as much as digits as its factorization.

1253405603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6562524.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 1253405603 is about 35403.4687989751. The cubic root of 1253405603 is about 1078.1947444826.

The spelling of 1253405603 in words is "one billion, two hundred fifty-three million, four hundred five thousand, six hundred three".