1868213771 has 2 divisors, whose sum is σ = 1868213772. Its totient is φ = 1868213770.

The previous prime is 1868213747. The next prime is 1868213777. The reversal of 1868213771 is 1773128681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1868213771 - 2⁶ = 1868213707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1868213777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934106885 + 934106886.

It is an arithmetic number, because the mean of its divisors is an integer number (934106886).

Almost surely, 2^1868213771 is an apocalyptic number.

1868213771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868213771 is an equidigital number, since it uses as much as digits as its factorization.

1868213771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 1868213771 is about 43222.8385347376. The cubic root of 1868213771 is about 1231.6165694385.

The spelling of 1868213771 in words is "one billion, eight hundred sixty-eight million, two hundred thirteen thousand, seven hundred seventy-one".