1045656821 has 8 divisors (see below), whose sum is σ = 1140991488. Its totient is φ = 950368000.

The previous prime is 1045656779. The next prime is 1045656839. The reversal of 1045656821 is 1286565401.

It is a happy number.

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 1045656821 - 2¹⁰ = 1045655797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045656841) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 51116 + ... + 68586.

It is an arithmetic number, because the mean of its divisors is an integer number (142623936).

Almost surely, 2^1045656821 is an apocalyptic number.

1045656821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1045656821 is a deficient number, since it is larger than the sum of its proper divisors (95334667).

1045656821 is a wasteful number, since it uses less digits than its factorization.

1045656821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22923.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1045656821 is about 32336.6173400991. The cubic root of 1045656821 is about 1014.9930260710.

The spelling of 1045656821 in words is "one billion, forty-five million, six hundred fifty-six thousand, eight hundred twenty-one".