1253535943 has 4 divisors (see below), whose sum is σ = 1367493768. Its totient is φ = 1139578120.

The previous prime is 1253535929. The next prime is 1253536003. The reversal of 1253535943 is 3495353521.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1253535943 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1253535896 and 1253535905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253533943) 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, 56978896 + ... + 56978917.

It is an arithmetic number, because the mean of its divisors is an integer number (341873442).

Almost surely, 2^1253535943 is an apocalyptic number.

1253535943 is a deficient number, since it is larger than the sum of its proper divisors (113957825).

1253535943 is a wasteful number, since it uses less digits than its factorization.

1253535943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113957824.

The product of its digits is 243000, while the sum is 40.

The square root of 1253535943 is about 35405.3095311988. The cubic root of 1253535943 is about 1078.2321165383.

The spelling of 1253535943 in words is "one billion, two hundred fifty-three million, five hundred thirty-five thousand, nine hundred forty-three".