197047861 has 2 divisors, whose sum is σ = 197047862. Its totient is φ = 197047860.

The previous prime is 197047847. The next prime is 197047891. The reversal of 197047861 is 168740791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156725361 + 40322500 = 12519^2 + 6350^2 .

It is an emirp because it is prime and its reverse (168740791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197047861 - 2¹¹ = 197045813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197047891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98523930 + 98523931.

It is an arithmetic number, because the mean of its divisors is an integer number (98523931).

Almost surely, 2^197047861 is an apocalyptic number.

It is an amenable number.

197047861 is a deficient number, since it is larger than the sum of its proper divisors (1).

197047861 is an equidigital number, since it uses as much as digits as its factorization.

197047861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 197047861 is about 14037.3737216048. The cubic root of 197047861 is about 581.9119041365.

The spelling of 197047861 in words is "one hundred ninety-seven million, forty-seven thousand, eight hundred sixty-one".