2647138381 has 2 divisors, whose sum is σ = 2647138382. Its totient is φ = 2647138380.

The previous prime is 2647138367. The next prime is 2647138409. The reversal of 2647138381 is 1838317462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2411792100 + 235346281 = 49110^2 + 15341^2 .

It is a cyclic number.

It is not a de Polignac number, because 2647138381 - 2⁷ = 2647138253 is a prime.

It is a super-2 number, since 2×2647138381² = 14014683216326602322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2647138331) 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, 1323569190 + 1323569191.

It is an arithmetic number, because the mean of its divisors is an integer number (1323569191).

Almost surely, 2^2647138381 is an apocalyptic number.

It is an amenable number.

2647138381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2647138381 is an equidigital number, since it uses as much as digits as its factorization.

2647138381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 2647138381 is about 51450.3486965832. The cubic root of 2647138381 is about 1383.3292126585.

The spelling of 2647138381 in words is "two billion, six hundred forty-seven million, one hundred thirty-eight thousand, three hundred eighty-one".