1221661175 has 48 divisors (see below), whose sum is σ = 1829025792. Its totient is φ = 791683200.

The previous prime is 1221661171. The next prime is 1221661211. The reversal of 1221661175 is 5711661221.

It is not a de Polignac number, because 1221661175 - 2² = 1221661171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221661171) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 230657 + ... + 235893.

It is an arithmetic number, because the mean of its divisors is an integer number (38104704).

Almost surely, 2^1221661175 is an apocalyptic number.

1221661175 is a deficient number, since it is larger than the sum of its proper divisors (607364617).

1221661175 is a wasteful number, since it uses less digits than its factorization.

1221661175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328 (or 5323 counting only the distinct ones).

The product of its digits is 5040, while the sum is 32.

The square root of 1221661175 is about 34952.2699548971. The cubic root of 1221661175 is about 1069.0144869391.

The spelling of 1221661175 in words is "one billion, two hundred twenty-one million, six hundred sixty-one thousand, one hundred seventy-five".