1630081 has 4 divisors (see below), whose sum is σ = 1636164. Its totient is φ = 1624000.

The previous prime is 1630051. The next prime is 1630091. The reversal of 1630081 is 1800361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1418481 + 211600 = 1191^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630081 - 2⁵ = 1630049 is a prime.

It is a super-2 number, since 2×1630081² = 5314328133122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1630021) 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 3 ways as a sum of consecutive naturals, for example, 2620 + ... + 3181.

It is an arithmetic number, because the mean of its divisors is an integer number (409041).

2^1630081 is an apocalyptic number.

It is an amenable number.

1630081 is a deficient number, since it is larger than the sum of its proper divisors (6083).

1630081 is an equidigital number, since it uses as much as digits as its factorization.

1630081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6082.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1630081 is about 1276.7462551345. The cubic root of 1630081 is about 117.6891415774.

The spelling of 1630081 in words is "one million, six hundred thirty thousand, eighty-one".