1221833461 has 4 divisors (see below), whose sum is σ = 1233930924. Its totient is φ = 1209736000.

The previous prime is 1221833447. The next prime is 1221833471. The reversal of 1221833461 is 1643381221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1033622500 + 188210961 = 32150^2 + 13719^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221833461 - 2⁹ = 1221832949 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221833471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6048580 + ... + 6048781.

It is an arithmetic number, because the mean of its divisors is an integer number (308482731).

Almost surely, 2^1221833461 is an apocalyptic number.

It is an amenable number.

1221833461 is a deficient number, since it is larger than the sum of its proper divisors (12097463).

1221833461 is a wasteful number, since it uses less digits than its factorization.

1221833461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12097462.

The product of its digits is 6912, while the sum is 31.

The square root of 1221833461 is about 34954.7344575810. The cubic root of 1221833461 is about 1069.0647375259.

The spelling of 1221833461 in words is "one billion, two hundred twenty-one million, eight hundred thirty-three thousand, four hundred sixty-one".