1855139701 has 2 divisors, whose sum is σ = 1855139702. Its totient is φ = 1855139700.

The previous prime is 1855139687. The next prime is 1855139717. The reversal of 1855139701 is 1079315581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1458094225 + 397045476 = 38185^2 + 19926^2 .

It is an emirp because it is prime and its reverse (1079315581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1855139701 - 2¹¹ = 1855137653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1855139101) 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, 927569850 + 927569851.

It is an arithmetic number, because the mean of its divisors is an integer number (927569851).

Almost surely, 2^1855139701 is an apocalyptic number.

It is an amenable number.

1855139701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855139701 is an equidigital number, since it uses as much as digits as its factorization.

1855139701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 40.

The square root of 1855139701 is about 43071.3327051764. The cubic root of 1855139701 is about 1228.7368222586.

The spelling of 1855139701 in words is "one billion, eight hundred fifty-five million, one hundred thirty-nine thousand, seven hundred one".