1631089 has 4 divisors (see below), whose sum is σ = 1641024. Its totient is φ = 1621156.

The previous prime is 1631059. The next prime is 1631101. The reversal of 1631089 is 9801361.

It is a happy number.

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: 9801361 = 1201 ⋅8161.

It is a cyclic number.

It is not a de Polignac number, because 1631089 - 2⁵ = 1631057 is a prime.

It is a Duffinian 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 (1631029) 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, 4717 + ... + 5050.

It is an arithmetic number, because the mean of its divisors is an integer number (410256).

2^1631089 is an apocalyptic number.

It is an amenable number.

1631089 is a deficient number, since it is larger than the sum of its proper divisors (9935).

1631089 is an equidigital number, since it uses as much as digits as its factorization.

1631089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9934.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1631089 is about 1277.1409475857. The cubic root of 1631089 is about 117.7133952209.

The spelling of 1631089 in words is "one million, six hundred thirty-one thousand, eighty-nine".