1154478821 has 8 divisors (see below), whose sum is σ = 1158527424. Its totient is φ = 1150437600.

The previous prime is 1154478803. The next prime is 1154478827. The reversal of 1154478821 is 1288744511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1154478821 - 2⁶ = 1154478757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154478827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640121 + ... + 641921.

It is an arithmetic number, because the mean of its divisors is an integer number (144815928).

Almost surely, 2^1154478821 is an apocalyptic number.

It is an amenable number.

1154478821 is a deficient number, since it is larger than the sum of its proper divisors (4048603).

1154478821 is a wasteful number, since it uses less digits than its factorization.

1154478821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691.

The product of its digits is 71680, while the sum is 41.

The square root of 1154478821 is about 33977.6223564863. The cubic root of 1154478821 is about 1049.0479112542.

The spelling of 1154478821 in words is "one billion, one hundred fifty-four million, four hundred seventy-eight thousand, eight hundred twenty-one".