1649868001 has 4 divisors (see below), whose sum is σ = 1653592752. Its totient is φ = 1646143252.

The previous prime is 1649867981. The next prime is 1649868013. The reversal of 1649868001 is 1008689461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1649868001 - 2⁷ = 1649867873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649868301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861711 + ... + 1862596.

It is an arithmetic number, because the mean of its divisors is an integer number (413398188).

Almost surely, 2^1649868001 is an apocalyptic number.

It is an amenable number.

1649868001 is a deficient number, since it is larger than the sum of its proper divisors (3724751).

1649868001 is an equidigital number, since it uses as much as digits as its factorization.

1649868001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724750.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 1649868001 is about 40618.5671953111. The cubic root of 1649868001 is about 1181.6342387792.

The spelling of 1649868001 in words is "one billion, six hundred forty-nine million, eight hundred sixty-eight thousand, one".