1900181009 has 2 divisors, whose sum is σ = 1900181010. Its totient is φ = 1900181008.

The previous prime is 1900180999. The next prime is 1900181027. The reversal of 1900181009 is 9001810091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 953080384 + 947100625 = 30872^2 + 30775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1900181009 - 2²⁴ = 1883403793 is a prime.

It is a super-2 number, since 2×1900181009² = 7221375733928516162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1900111009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950090504 + 950090505.

It is an arithmetic number, because the mean of its divisors is an integer number (950090505).

Almost surely, 2^1900181009 is an apocalyptic number.

It is an amenable number.

1900181009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900181009 is an equidigital number, since it uses as much as digits as its factorization.

1900181009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1900181009 is about 43591.0657015861. The cubic root of 1900181009 is about 1238.6016601231.

The spelling of 1900181009 in words is "one billion, nine hundred million, one hundred eighty-one thousand, nine".