1865371049 has 2 divisors, whose sum is σ = 1865371050. Its totient is φ = 1865371048.

The previous prime is 1865371009. The next prime is 1865371051. The reversal of 1865371049 is 9401735681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1828161049 + 37210000 = 42757^2 + 6100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865371049 - 2²⁴ = 1848593833 is a prime.

Together with 1865371051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1865371009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932685524 + 932685525.

It is an arithmetic number, because the mean of its divisors is an integer number (932685525).

Almost surely, 2^1865371049 is an apocalyptic number.

It is an amenable number.

1865371049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865371049 is an equidigital number, since it uses as much as digits as its factorization.

1865371049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 1865371049 is about 43189.9415257766. The cubic root of 1865371049 is about 1230.9915658683.

The spelling of 1865371049 in words is "one billion, eight hundred sixty-five million, three hundred seventy-one thousand, forty-nine".