192979921 has 2 divisors, whose sum is σ = 192979922. Its totient is φ = 192979920.

The previous prime is 192979909. The next prime is 192979939. The reversal of 192979921 is 129979291.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186704896 + 6275025 = 13664^2 + 2505^2 .

It is a cyclic number.

It is not a de Polignac number, because 192979921 - 2⁵ = 192979889 is a prime.

It is not a weakly prime, because it can be changed into another prime (192971921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96489960 + 96489961.

It is an arithmetic number, because the mean of its divisors is an integer number (96489961).

Almost surely, 2^192979921 is an apocalyptic number.

It is an amenable number.

192979921 is a deficient number, since it is larger than the sum of its proper divisors (1).

192979921 is an equidigital number, since it uses as much as digits as its factorization.

192979921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 49.

The square root of 192979921 is about 13891.7213116302. The cubic root of 192979921 is about 577.8796149787.

The spelling of 192979921 in words is "one hundred ninety-two million, nine hundred seventy-nine thousand, nine hundred twenty-one".