192648821 has 8 divisors (see below), whose sum is σ = 194315544. Its totient is φ = 190988800.

The previous prime is 192648803. The next prime is 192648829. The reversal of 192648821 is 128846291.

192648821 = 9814² + 9815².

It can be written as a sum of positive squares in 4 ways, for example, as 96334225 + 96314596 = 9815^2 + 9814^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-192648821 is a prime.

It is a super-2 number, since 2×192648821² = 74227136465380082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (192648829) 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, 67985 + ... + 70761.

It is an arithmetic number, because the mean of its divisors is an integer number (24289443).

Almost surely, 2^192648821 is an apocalyptic number.

192648821 is the 9815-th centered square number.

It is an amenable number.

192648821 is a deficient number, since it is larger than the sum of its proper divisors (1666723).

192648821 is a wasteful number, since it uses less digits than its factorization.

192648821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351.

The product of its digits is 55296, while the sum is 41.

The square root of 192648821 is about 13879.7990259225. The cubic root of 192648821 is about 577.5489320931.

The spelling of 192648821 in words is "one hundred ninety-two million, six hundred forty-eight thousand, eight hundred twenty-one".