1985019137 has 2 divisors, whose sum is σ = 1985019138. Its totient is φ = 1985019136.

The previous prime is 1985019131. The next prime is 1985019181. The reversal of 1985019137 is 7319105891.

It is an a-pointer prime, because the next prime (1985019181) can be obtained adding 1985019137 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1947368641 + 37650496 = 44129^2 + 6136^2 .

It is an emirp because it is prime and its reverse (7319105891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1985019137 - 2⁴ = 1985019121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985019131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992509568 + 992509569.

It is an arithmetic number, because the mean of its divisors is an integer number (992509569).

Almost surely, 2^1985019137 is an apocalyptic number.

It is an amenable number.

1985019137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985019137 is an equidigital number, since it uses as much as digits as its factorization.

1985019137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 44.

The square root of 1985019137 is about 44553.5535844224. The cubic root of 1985019137 is about 1256.7673785124.

The spelling of 1985019137 in words is "one billion, nine hundred eighty-five million, nineteen thousand, one hundred thirty-seven".