119661721 has 3 divisors (see below), whose sum is σ = 119672661. Its totient is φ = 119650782.

The previous prime is 119661719. The next prime is 119661749. The reversal of 119661721 is 127166911.

The square root of 119661721 is 10939.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 119661721 - 2¹ = 119661719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (119661701) 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 2 ways as a sum of consecutive naturals, for example, 5470 + ... + 16408.

It is an arithmetic number, because the mean of its divisors is an integer number (39890887).

Almost surely, 2^119661721 is an apocalyptic number.

119661721 is the 10939-th square number.

119661721 is the 5470-th centered octagonal number.

It is an amenable number.

119661721 is a deficient number, since it is larger than the sum of its proper divisors (10940).

119661721 is an frugal number, since it uses more digits than its factorization.

119661721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21878 (or 10939 counting only the distinct ones).

The product of its digits is 4536, while the sum is 34.

The cubic root of 119661721 is about 492.7784965796.

The spelling of 119661721 in words is "one hundred nineteen million, six hundred sixty-one thousand, seven hundred twenty-one".