196772921 has 4 divisors (see below), whose sum is σ = 196906212. Its totient is φ = 196639632.

The previous prime is 196772897. The next prime is 196772959. The reversal of 196772921 is 129277691.

196772921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129277691 = 19 ⋅6804089.

It can be written as a sum of positive squares in 2 ways, for example, as 175933696 + 20839225 = 13264^2 + 4565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196772921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (196772971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64406 + ... + 67391.

It is an arithmetic number, because the mean of its divisors is an integer number (49226553).

Almost surely, 2^196772921 is an apocalyptic number.

It is an amenable number.

196772921 is a deficient number, since it is larger than the sum of its proper divisors (133291).

196772921 is a wasteful number, since it uses less digits than its factorization.

196772921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133290.

The product of its digits is 95256, while the sum is 44.

The square root of 196772921 is about 14027.5771607217. The cubic root of 196772921 is about 581.6411318017.

The spelling of 196772921 in words is "one hundred ninety-six million, seven hundred seventy-two thousand, nine hundred twenty-one".