197678101 has 2 divisors, whose sum is σ = 197678102. Its totient is φ = 197678100.

The previous prime is 197678059. The next prime is 197678153. The reversal of 197678101 is 101876791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129367876 + 68310225 = 11374^2 + 8265^2 .

It is a cyclic number.

It is not a de Polignac number, because 197678101 - 2⁹ = 197677589 is a prime.

It is a super-2 number, since 2×197678101² = 78153263229932402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197678171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98839050 + 98839051.

It is an arithmetic number, because the mean of its divisors is an integer number (98839051).

Almost surely, 2^197678101 is an apocalyptic number.

It is an amenable number.

197678101 is a deficient number, since it is larger than the sum of its proper divisors (1).

197678101 is an equidigital number, since it uses as much as digits as its factorization.

197678101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 40.

The square root of 197678101 is about 14059.8044438747. The cubic root of 197678101 is about 582.5316416466.

The spelling of 197678101 in words is "one hundred ninety-seven million, six hundred seventy-eight thousand, one hundred one".