197627681 has 2 divisors, whose sum is σ = 197627682. Its totient is φ = 197627680.

The previous prime is 197627657. The next prime is 197627701. The reversal of 197627681 is 186726791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184552225 + 13075456 = 13585^2 + 3616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197627681 is a prime.

It is a super-2 number, since 2×197627681² = 78113400594875522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (197627981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98813840 + 98813841.

It is an arithmetic number, because the mean of its divisors is an integer number (98813841).

Almost surely, 2^197627681 is an apocalyptic number.

It is an amenable number.

197627681 is a deficient number, since it is larger than the sum of its proper divisors (1).

197627681 is an equidigital number, since it uses as much as digits as its factorization.

197627681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 197627681 is about 14058.0112747145. The cubic root of 197627681 is about 582.4821103754.

The spelling of 197627681 in words is "one hundred ninety-seven million, six hundred twenty-seven thousand, six hundred eighty-one".