1630121 has 4 divisors (see below), whose sum is σ = 1660932. Its totient is φ = 1599312.

The previous prime is 1630117. The next prime is 1630127. The reversal of 1630121 is 1210361.

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 931225 + 698896 = 965^2 + 836^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630121 - 2² = 1630117 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1630096 and 1630105.

It is not an unprimeable number, because it can be changed into a prime (1630127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15326 + ... + 15431.

It is an arithmetic number, because the mean of its divisors is an integer number (415233).

2^1630121 is an apocalyptic number.

It is an amenable number.

1630121 is a deficient number, since it is larger than the sum of its proper divisors (30811).

1630121 is an equidigital number, since it uses as much as digits as its factorization.

1630121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30810.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1630121 is about 1276.7619198582. The cubic root of 1630121 is about 117.6901042141.

Adding to 1630121 its reverse (1210361), we get a palindrome (2840482).

The spelling of 1630121 in words is "one million, six hundred thirty thousand, one hundred twenty-one".