900180109 has 2 divisors, whose sum is σ = 900180110. Its totient is φ = 900180108.

The previous prime is 900180101. The next prime is 900180121. The reversal of 900180109 is 901081009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 900180009 + 100 = 30003^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 900180109 - 2³ = 900180101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (900180101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450090054 + 450090055.

It is an arithmetic number, because the mean of its divisors is an integer number (450090055).

Almost surely, 2^900180109 is an apocalyptic number.

It is an amenable number.

900180109 is a deficient number, since it is larger than the sum of its proper divisors (1).

900180109 is an equidigital number, since it uses as much as digits as its factorization.

900180109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 900180109 is about 30003.0016665000. The cubic root of 900180109 is about 965.5537852460.

The spelling of 900180109 in words is "nine hundred million, one hundred eighty thousand, one hundred nine".