197669881 has 2 divisors, whose sum is σ = 197669882. Its totient is φ = 197669880.

The previous prime is 197669869. The next prime is 197669903. The reversal of 197669881 is 188966791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197655481 + 14400 = 14059^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 197669881 - 2¹³ = 197661689 is a prime.

It is a super-2 number, since 2×197669881² = 78146763709108322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (197663881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98834940 + 98834941.

It is an arithmetic number, because the mean of its divisors is an integer number (98834941).

Almost surely, 2^197669881 is an apocalyptic number.

It is an amenable number.

197669881 is a deficient number, since it is larger than the sum of its proper divisors (1).

197669881 is an equidigital number, since it uses as much as digits as its factorization.

197669881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 55.

The square root of 197669881 is about 14059.5121181355. The cubic root of 197669881 is about 582.5235671112.

The spelling of 197669881 in words is "one hundred ninety-seven million, six hundred sixty-nine thousand, eight hundred eighty-one".