1142541809 has 4 divisors (see below), whose sum is σ = 1144043940. Its totient is φ = 1141039680.

The previous prime is 1142541791. The next prime is 1142541823. The reversal of 1142541809 is 9081452411.

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 106667584 + 1035874225 = 10328^2 + 32185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142541809 - 2²⁸ = 874106353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1142541209) 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, 749924 + ... + 751445.

It is an arithmetic number, because the mean of its divisors is an integer number (286010985).

Almost surely, 2^1142541809 is an apocalyptic number.

It is an amenable number.

1142541809 is a deficient number, since it is larger than the sum of its proper divisors (1502131).

1142541809 is an equidigital number, since it uses as much as digits as its factorization.

1142541809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502130.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1142541809 is about 33801.5060167443. The cubic root of 1142541809 is about 1045.4197497221.

The spelling of 1142541809 in words is "one billion, one hundred forty-two million, five hundred forty-one thousand, eight hundred nine".