1631121 has 4 divisors (see below), whose sum is σ = 2174832. Its totient is φ = 1087412.

The previous prime is 1631117. The next prime is 1631143. The reversal of 1631121 is 1211361.

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: 1211361 = 3 ⋅403787.

It is a cyclic number.

It is not a de Polignac number, because 1631121 - 2² = 1631117 is a prime.

It is a D-number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1631121.

It is not an unprimeable number, because it can be changed into a prime (1631101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271851 + ... + 271856.

It is an arithmetic number, because the mean of its divisors is an integer number (543708).

2^1631121 is an apocalyptic number.

It is an amenable number.

1631121 is a deficient number, since it is larger than the sum of its proper divisors (543711).

1631121 is an equidigital number, since it uses as much as digits as its factorization.

1631121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543710.

The product of its digits is 36, while the sum is 15.

The square root of 1631121 is about 1277.1534755072. The cubic root of 1631121 is about 117.7141650142.

Adding to 1631121 its reverse (1211361), we get a palindrome (2842482).

The spelling of 1631121 in words is "one million, six hundred thirty-one thousand, one hundred twenty-one".