801649 has 8 divisors (see below), whose sum is σ = 832832. Its totient is φ = 771120.

The previous prime is 801641. The next prime is 801677. The reversal of 801649 is 946108.

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 801649 - 2³ = 801641 is a prime.

It is a super-2 number, since 2×801649² = 1285282238402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4339 + ... + 4519.

It is an arithmetic number, because the mean of its divisors is an integer number (104104).

2⁸⁰¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

801649 is a deficient number, since it is larger than the sum of its proper divisors (31183).

801649 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (801648) it forms an eRAP, since the sums of their prime factors are consecutive (326 and 327).

801649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 801649 is about 895.3485354877. The cubic root of 801649 is about 92.8955160646.

The spelling of 801649 in words is "eight hundred one thousand, six hundred forty-nine".