196467781 has 2 divisors, whose sum is σ = 196467782. Its totient is φ = 196467780.

The previous prime is 196467769. The next prime is 196467811. The reversal of 196467781 is 187764691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193349025 + 3118756 = 13905^2 + 1766^2 .

It is an emirp because it is prime and its reverse (187764691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196467781 - 2⁵ = 196467749 is a prime.

It is a super-2 number, since 2×196467781² = 77199177942127922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196467701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98233890 + 98233891.

It is an arithmetic number, because the mean of its divisors is an integer number (98233891).

Almost surely, 2^196467781 is an apocalyptic number.

It is an amenable number.

196467781 is a deficient number, since it is larger than the sum of its proper divisors (1).

196467781 is an equidigital number, since it uses as much as digits as its factorization.

196467781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 196467781 is about 14016.6965080935. The cubic root of 196467781 is about 581.3403217870.

The spelling of 196467781 in words is "one hundred ninety-six million, four hundred sixty-seven thousand, seven hundred eighty-one".