197982457 has 2 divisors, whose sum is σ = 197982458. Its totient is φ = 197982456.

The previous prime is 197982437. The next prime is 197982469. The reversal of 197982457 is 754289791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187032976 + 10949481 = 13676^2 + 3309^2 .

It is a cyclic number.

It is not a de Polignac number, because 197982457 - 2²³ = 189593849 is a prime.

It is not a weakly prime, because it can be changed into another prime (197982427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98991228 + 98991229.

It is an arithmetic number, because the mean of its divisors is an integer number (98991229).

Almost surely, 2^197982457 is an apocalyptic number.

It is an amenable number.

197982457 is a deficient number, since it is larger than the sum of its proper divisors (1).

197982457 is an equidigital number, since it uses as much as digits as its factorization.

197982457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 52.

The square root of 197982457 is about 14070.6239023009. The cubic root of 197982457 is about 582.8304541860.

The spelling of 197982457 in words is "one hundred ninety-seven million, nine hundred eighty-two thousand, four hundred fifty-seven".