276805649 has 2 divisors, whose sum is σ = 276805650. Its totient is φ = 276805648.

The previous prime is 276805643. The next prime is 276805681. The reversal of 276805649 is 946508672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262213249 + 14592400 = 16193^2 + 3820^2 .

It is a cyclic number.

It is not a de Polignac number, because 276805649 - 2²⁰ = 275757073 is a prime.

It is a super-2 number, since 2×276805649² = 153242734636622402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (276805643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138402824 + 138402825.

It is an arithmetic number, because the mean of its divisors is an integer number (138402825).

Almost surely, 2^276805649 is an apocalyptic number.

It is an amenable number.

276805649 is a deficient number, since it is larger than the sum of its proper divisors (1).

276805649 is an equidigital number, since it uses as much as digits as its factorization.

276805649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 276805649 is about 16637.4772426591. The cubic root of 276805649 is about 651.7158994411.

The spelling of 276805649 in words is "two hundred seventy-six million, eight hundred five thousand, six hundred forty-nine".