197790457 has 2 divisors, whose sum is σ = 197790458. Its totient is φ = 197790456.

The previous prime is 197790449. The next prime is 197790473. The reversal of 197790457 is 754097791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182898576 + 14891881 = 13524^2 + 3859^2 .

It is a cyclic number.

It is not a de Polignac number, because 197790457 - 2³ = 197790449 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197790457.

It is not a weakly prime, because it can be changed into another prime (197790157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98895228 + 98895229.

It is an arithmetic number, because the mean of its divisors is an integer number (98895229).

Almost surely, 2^197790457 is an apocalyptic number.

It is an amenable number.

197790457 is a deficient number, since it is larger than the sum of its proper divisors (1).

197790457 is an equidigital number, since it uses as much as digits as its factorization.

197790457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 555660, while the sum is 49.

The square root of 197790457 is about 14063.7995221775. The cubic root of 197790457 is about 582.6419869140.

The spelling of 197790457 in words is "one hundred ninety-seven million, seven hundred ninety thousand, four hundred fifty-seven".