1630901 has 4 divisors (see below), whose sum is σ = 1633632. Its totient is φ = 1628172.

The previous prime is 1630897. The next prime is 1630913. The reversal of 1630901 is 1090361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1090361 = 23 ⋅47407.

It is a cyclic number.

It is not a de Polignac number, because 1630901 - 2² = 1630897 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630501) 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, 41 + ... + 1806.

It is an arithmetic number, because the mean of its divisors is an integer number (408408).

2^1630901 is an apocalyptic number.

It is an amenable number.

1630901 is a deficient number, since it is larger than the sum of its proper divisors (2731).

1630901 is an equidigital number, since it uses as much as digits as its factorization.

1630901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1630901 is about 1277.0673435649. The cubic root of 1630901 is about 117.7088724821.

The spelling of 1630901 in words is "one million, six hundred thirty thousand, nine hundred one".