1868196257 has 2 divisors, whose sum is σ = 1868196258. Its totient is φ = 1868196256.

The previous prime is 1868196247. The next prime is 1868196259. The reversal of 1868196257 is 7526918681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1461609361 + 406586896 = 38231^2 + 20164^2 .

It is an emirp because it is prime and its reverse (7526918681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1868196257 - 2³⁰ = 794454433 is a prime.

Together with 1868196259, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1868196199 and 1868196208.

It is not a weakly prime, because it can be changed into another prime (1868196259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934098128 + 934098129.

It is an arithmetic number, because the mean of its divisors is an integer number (934098129).

Almost surely, 2^1868196257 is an apocalyptic number.

It is an amenable number.

1868196257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868196257 is an equidigital number, since it uses as much as digits as its factorization.

1868196257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The square root of 1868196257 is about 43222.6359330386. The cubic root of 1868196257 is about 1231.6127207354.

The spelling of 1868196257 in words is "one billion, eight hundred sixty-eight million, one hundred ninety-six thousand, two hundred fifty-seven".