196777381 has 2 divisors, whose sum is σ = 196777382. Its totient is φ = 196777380.

The previous prime is 196777337. The next prime is 196777411. The reversal of 196777381 is 183777691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125104225 + 71673156 = 11185^2 + 8466^2 .

It is a cyclic number.

It is not a de Polignac number, because 196777381 - 2⁷ = 196777253 is a prime.

It is a super-2 number, since 2×196777381² = 77442675346438322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196771381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98388690 + 98388691.

It is an arithmetic number, because the mean of its divisors is an integer number (98388691).

Almost surely, 2^196777381 is an apocalyptic number.

It is an amenable number.

196777381 is a deficient number, since it is larger than the sum of its proper divisors (1).

196777381 is an equidigital number, since it uses as much as digits as its factorization.

196777381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 49.

The square root of 196777381 is about 14027.7361323914. The cubic root of 196777381 is about 581.6455262069.

The spelling of 196777381 in words is "one hundred ninety-six million, seven hundred seventy-seven thousand, three hundred eighty-one".