1631641 has 4 divisors (see below), whose sum is σ = 1779984. Its totient is φ = 1483300.

The previous prime is 1631639. The next prime is 1631647. The reversal of 1631641 is 1461361.

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: 1461361 = 11 ⋅132851.

It is a cyclic number.

It is not a de Polignac number, because 1631641 - 2¹ = 1631639 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631647) 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, 74155 + ... + 74176.

It is an arithmetic number, because the mean of its divisors is an integer number (444996).

2^1631641 is an apocalyptic number.

1631641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1631641 is a deficient number, since it is larger than the sum of its proper divisors (148343).

1631641 is a wasteful number, since it uses less digits than its factorization.

1631641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148342.

The product of its digits is 432, while the sum is 22.

The square root of 1631641 is about 1277.3570370104. The cubic root of 1631641 is about 117.7266727440.

The spelling of 1631641 in words is "one million, six hundred thirty-one thousand, six hundred forty-one".