1223001661 has 8 divisors (see below), whose sum is σ = 1400054400. Its totient is φ = 1046533488.

The previous prime is 1223001653. The next prime is 1223001673. The reversal of 1223001661 is 1661003221.

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

It is not a de Polignac number, because 1223001661 - 2³ = 1223001653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223001061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141646 + ... + 150031.

It is an arithmetic number, because the mean of its divisors is an integer number (175006800).

Almost surely, 2^1223001661 is an apocalyptic number.

It is an amenable number.

1223001661 is a deficient number, since it is larger than the sum of its proper divisors (177052739).

1223001661 is an equidigital number, since it uses as much as digits as its factorization.

1223001661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292283.

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

The square root of 1223001661 is about 34971.4406480488. The cubic root of 1223001661 is about 1069.4053413963.

Adding to 1223001661 its reverse (1661003221), we get a palindrome (2884004882).

The spelling of 1223001661 in words is "one billion, two hundred twenty-three million, one thousand, six hundred sixty-one".