1211641 has 8 divisors (see below), whose sum is σ = 1292544. Its totient is φ = 1131840.

The previous prime is 1211629. The next prime is 1211647. The reversal of 1211641 is 1461121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211641 is a prime.

1211641 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211647) 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 7 ways as a sum of consecutive naturals, for example, 4336 + ... + 4606.

It is an arithmetic number, because the mean of its divisors is an integer number (161568).

2^1211641 is an apocalyptic number.

It is an amenable number.

1211641 is a deficient number, since it is larger than the sum of its proper divisors (80903).

1211641 is a wasteful number, since it uses less digits than its factorization.

1211641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its digits is 48, while the sum is 16.

The square root of 1211641 is about 1100.7456563621. The cubic root of 1211641 is about 106.6083741824.

Adding to 1211641 its reverse (1461121), we get a palindrome (2672762).

The spelling of 1211641 in words is "one million, two hundred eleven thousand, six hundred forty-one".