1172204661 has 8 divisors (see below), whose sum is σ = 1564841920. Its totient is φ = 780518592.

The previous prime is 1172204651. The next prime is 1172204669. The reversal of 1172204661 is 1664022711.

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

It is not a de Polignac number, because 1172204661 - 2⁹ = 1172204149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172204669) 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, 234916 + ... + 239853.

It is an arithmetic number, because the mean of its divisors is an integer number (195605240).

Almost surely, 2^1172204661 is an apocalyptic number.

It is an amenable number.

1172204661 is a deficient number, since it is larger than the sum of its proper divisors (392637259).

1172204661 is an equidigital number, since it uses as much as digits as its factorization.

1172204661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475595.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1172204661 is about 34237.4745125864. The cubic root of 1172204661 is about 1054.3896834627.

The spelling of 1172204661 in words is "one billion, one hundred seventy-two million, two hundred four thousand, six hundred sixty-one".