1253436605 has 16 divisors (see below), whose sum is σ = 1635649200. Its totient is φ = 918254592.

The previous prime is 1253436599. The next prime is 1253436617. The reversal of 1253436605 is 5066343521.

It can be written as a sum of positive squares in 8 ways, for example, as 18757561 + 1234679044 = 4331^2 + 35138^2 .

It is not a de Polignac number, because 1253436605 - 2²² = 1249242301 is a prime.

It is a super-2 number, since 2×1253436605² = 3142206645507852050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196130 + ... + 202419.

It is an arithmetic number, because the mean of its divisors is an integer number (102228075).

Almost surely, 2^1253436605 is an apocalyptic number.

It is an amenable number.

1253436605 is a deficient number, since it is larger than the sum of its proper divisors (382212595).

1253436605 is a wasteful number, since it uses less digits than its factorization.

1253436605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398608.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 1253436605 is about 35403.9066347204. The cubic root of 1253436605 is about 1078.2036338418.

The spelling of 1253436605 in words is "one billion, two hundred fifty-three million, four hundred thirty-six thousand, six hundred five".