2138305649 has 2 divisors, whose sum is σ = 2138305650. Its totient is φ = 2138305648.

The previous prime is 2138305621. The next prime is 2138305681. The reversal of 2138305649 is 9465038312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2128161424 + 10144225 = 46132^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138305649 - 2¹⁶ = 2138240113 is a prime.

It is a super-2 number, since 2×2138305649² = 9144702097090622402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2138307649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069152824 + 1069152825.

It is an arithmetic number, because the mean of its divisors is an integer number (1069152825).

Almost surely, 2^2138305649 is an apocalyptic number.

It is an amenable number.

2138305649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138305649 is an equidigital number, since it uses as much as digits as its factorization.

2138305649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 2138305649 is about 46241.8171031373. The cubic root of 2138305649 is about 1288.3185530201.

The spelling of 2138305649 in words is "two billion, one hundred thirty-eight million, three hundred five thousand, six hundred forty-nine".