2649418381 has 2 divisors, whose sum is σ = 2649418382. Its totient is φ = 2649418380.

The previous prime is 2649418301. The next prime is 2649418417. The reversal of 2649418381 is 1838149462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2297668356 + 351750025 = 47934^2 + 18755^2 .

It is a cyclic number.

It is not a de Polignac number, because 2649418381 - 2²⁹ = 2112547469 is a prime.

It is a super-2 number, since 2×2649418381² = 14038835515161322322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2649418301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1324709190 + 1324709191.

It is an arithmetic number, because the mean of its divisors is an integer number (1324709191).

Almost surely, 2^2649418381 is an apocalyptic number.

It is an amenable number.

2649418381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2649418381 is an equidigital number, since it uses as much as digits as its factorization.

2649418381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 46.

The square root of 2649418381 is about 51472.5012118121. The cubic root of 2649418381 is about 1383.7262559389.

The spelling of 2649418381 in words is "two billion, six hundred forty-nine million, four hundred eighteen thousand, three hundred eighty-one".