197628401 has 2 divisors, whose sum is σ = 197628402. Its totient is φ = 197628400.

The previous prime is 197628337. The next prime is 197628419. The reversal of 197628401 is 104826791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192543376 + 5085025 = 13876^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 197628401 - 2⁶ = 197628337 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (197628461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98814200 + 98814201.

It is an arithmetic number, because the mean of its divisors is an integer number (98814201).

Almost surely, 2^197628401 is an apocalyptic number.

It is an amenable number.

197628401 is a deficient number, since it is larger than the sum of its proper divisors (1).

197628401 is an equidigital number, since it uses as much as digits as its factorization.

197628401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 197628401 is about 14058.0368828653. The cubic root of 197628401 is about 582.4828177436.

The spelling of 197628401 in words is "one hundred ninety-seven million, six hundred twenty-eight thousand, four hundred one".