1865920313 has 2 divisors, whose sum is σ = 1865920314. Its totient is φ = 1865920312.

The previous prime is 1865920237. The next prime is 1865920321. The reversal of 1865920313 is 3130295681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1847968144 + 17952169 = 42988^2 + 4237^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865920313 - 2²⁴ = 1849143097 is a prime.

It is a super-2 number, since 2×1865920313² = 6963317228932035938, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1865920363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932960156 + 932960157.

It is an arithmetic number, because the mean of its divisors is an integer number (932960157).

Almost surely, 2^1865920313 is an apocalyptic number.

It is an amenable number.

1865920313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865920313 is an equidigital number, since it uses as much as digits as its factorization.

1865920313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1865920313 is about 43196.2997605119. The cubic root of 1865920313 is about 1231.1123770422.

The spelling of 1865920313 in words is "one billion, eight hundred sixty-five million, nine hundred twenty thousand, three hundred thirteen".