197881477 has 2 divisors, whose sum is σ = 197881478. Its totient is φ = 197881476.

The previous prime is 197881469. The next prime is 197881483. The reversal of 197881477 is 774188791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197290116 + 591361 = 14046^2 + 769^2 .

It is an emirp because it is prime and its reverse (774188791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197881477 - 2³ = 197881469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197881427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98940738 + 98940739.

It is an arithmetic number, because the mean of its divisors is an integer number (98940739).

Almost surely, 2^197881477 is an apocalyptic number.

It is an amenable number.

197881477 is a deficient number, since it is larger than the sum of its proper divisors (1).

197881477 is an equidigital number, since it uses as much as digits as its factorization.

197881477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 52.

The square root of 197881477 is about 14067.0351176074. The cubic root of 197881477 is about 582.7313473778.

The spelling of 197881477 in words is "one hundred ninety-seven million, eight hundred eighty-one thousand, four hundred seventy-seven".