1949935181 has 2 divisors, whose sum is σ = 1949935182. Its totient is φ = 1949935180.

The previous prime is 1949935177. The next prime is 1949935199. The reversal of 1949935181 is 1815399491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1482943081 + 466992100 = 38509^2 + 21610^2 .

It is an emirp because it is prime and its reverse (1815399491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1949935181 - 2² = 1949935177 is a prime.

It is a super-2 number, since 2×1949935181² = 7604494420203005522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1949935171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974967590 + 974967591.

It is an arithmetic number, because the mean of its divisors is an integer number (974967591).

Almost surely, 2^1949935181 is an apocalyptic number.

It is an amenable number.

1949935181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949935181 is an equidigital number, since it uses as much as digits as its factorization.

1949935181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 50.

The square root of 1949935181 is about 44158.0703948893. The cubic root of 1949935181 is about 1249.3191344851.

The spelling of 1949935181 in words is "one billion, nine hundred forty-nine million, nine hundred thirty-five thousand, one hundred eighty-one".