197981107 has 2 divisors, whose sum is σ = 197981108. Its totient is φ = 197981106.

The previous prime is 197981093. The next prime is 197981131. The reversal of 197981107 is 701189791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197981107 - 2²³ = 189592499 is a prime.

It is not a weakly prime, because it can be changed into another prime (197981177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98990553 + 98990554.

It is an arithmetic number, because the mean of its divisors is an integer number (98990554).

Almost surely, 2^197981107 is an apocalyptic number.

197981107 is a deficient number, since it is larger than the sum of its proper divisors (1).

197981107 is an equidigital number, since it uses as much as digits as its factorization.

197981107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 43.

The square root of 197981107 is about 14070.5759299326. The cubic root of 197981107 is about 582.8291294510.

The spelling of 197981107 in words is "one hundred ninety-seven million, nine hundred eighty-one thousand, one hundred seven".