1630903409 has 2 divisors, whose sum is σ = 1630903410. Its totient is φ = 1630903408.

The previous prime is 1630903387. The next prime is 1630903411. The reversal of 1630903409 is 9043090361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 867597025 + 763306384 = 29455^2 + 27628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630903409 is a prime.

Together with 1630903411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1630903009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815451704 + 815451705.

It is an arithmetic number, because the mean of its divisors is an integer number (815451705).

Almost surely, 2^1630903409 is an apocalyptic number.

It is an amenable number.

1630903409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630903409 is an equidigital number, since it uses as much as digits as its factorization.

1630903409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 1630903409 is about 40384.4451367107. The cubic root of 1630903409 is about 1177.0893043791.

The spelling of 1630903409 in words is "one billion, six hundred thirty million, nine hundred three thousand, four hundred nine".