1154928809 has 4 divisors (see below), whose sum is σ = 1158200916. Its totient is φ = 1151656704.

The previous prime is 1154928763. The next prime is 1154928821. The reversal of 1154928809 is 9088294511.

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 740928400 + 414000409 = 27220^2 + 20347^2 .

It is a cyclic number.

It is not a de Polignac number, because 1154928809 - 2⁸ = 1154928553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1154928829) 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, 1635524 + ... + 1636229.

It is an arithmetic number, because the mean of its divisors is an integer number (289550229).

Almost surely, 2^1154928809 is an apocalyptic number.

It is an amenable number.

1154928809 is a deficient number, since it is larger than the sum of its proper divisors (3272107).

1154928809 is an equidigital number, since it uses as much as digits as its factorization.

1154928809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272106.

The product of its (nonzero) digits is 207360, while the sum is 47.

The square root of 1154928809 is about 33984.2435402055. The cubic root of 1154928809 is about 1049.1841914075.

The spelling of 1154928809 in words is "one billion, one hundred fifty-four million, nine hundred twenty-eight thousand, eight hundred nine".