197662981 has 2 divisors, whose sum is σ = 197662982. Its totient is φ = 197662980.

The previous prime is 197662973. The next prime is 197663003. The reversal of 197662981 is 189266791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102697956 + 94965025 = 10134^2 + 9745^2 .

It is a cyclic number.

It is not a de Polignac number, because 197662981 - 2³ = 197662973 is a prime.

It is a super-2 number, since 2×197662981² = 78141308115612722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197662951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98831490 + 98831491.

It is an arithmetic number, because the mean of its divisors is an integer number (98831491).

Almost surely, 2^197662981 is an apocalyptic number.

It is an amenable number.

197662981 is a deficient number, since it is larger than the sum of its proper divisors (1).

197662981 is an equidigital number, since it uses as much as digits as its factorization.

197662981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 197662981 is about 14059.2667305233. The cubic root of 197662981 is about 582.5167890437.

The spelling of 197662981 in words is "one hundred ninety-seven million, six hundred sixty-two thousand, nine hundred eighty-one".