1851315139 has 2 divisors, whose sum is σ = 1851315140. Its totient is φ = 1851315138.

The previous prime is 1851315127. The next prime is 1851315199. The reversal of 1851315139 is 9315131581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1851315139 - 2²¹ = 1849217987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1851315098 and 1851315107.

It is not a weakly prime, because it can be changed into another prime (1851315119) 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, 925657569 + 925657570.

It is an arithmetic number, because the mean of its divisors is an integer number (925657570).

Almost surely, 2^1851315139 is an apocalyptic number.

1851315139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851315139 is an equidigital number, since it uses as much as digits as its factorization.

1851315139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 37.

The square root of 1851315139 is about 43026.9117994773. The cubic root of 1851315139 is about 1227.8918520606.

The spelling of 1851315139 in words is "one billion, eight hundred fifty-one million, three hundred fifteen thousand, one hundred thirty-nine".