4649557921 has 8 divisors (see below), whose sum is σ = 4726862888. Its totient is φ = 4572288000.

The previous prime is 4649557903. The next prime is 4649557931. The reversal of 4649557921 is 1297559464.

It can be written as a sum of positive squares in 4 ways, for example, as 104775696 + 4544782225 = 10236^2 + 67415^2 .

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

It is a 6-Lehmer number, since φ(4649557921) divides (4649557921-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 4649557921 - 2⁵ = 4649557889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4649557931) 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, 522691 + ... + 531511.

It is an arithmetic number, because the mean of its divisors is an integer number (590857861).

Almost surely, 2^4649557921 is an apocalyptic number.

It is an amenable number.

4649557921 is a deficient number, since it is larger than the sum of its proper divisors (77304967).

4649557921 is an equidigital number, since it uses as much as digits as its factorization.

4649557921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17523.

The product of its digits is 2721600, while the sum is 52.

The square root of 4649557921 is about 68187.6669273850. Note that the first 3 decimals coincide. The cubic root of 4649557921 is about 1669.0546385512.

The spelling of 4649557921 in words is "four billion, six hundred forty-nine million, five hundred fifty-seven thousand, nine hundred twenty-one".