2781629 has 2 divisors, whose sum is σ = 2781630. Its totient is φ = 2781628.

The previous prime is 2781617. The next prime is 2781637. The reversal of 2781629 is 9261872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2256004 + 525625 = 1502^2 + 725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781029) 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, 1390814 + 1390815.

It is an arithmetic number, because the mean of its divisors is an integer number (1390815).

2^2781629 is an apocalyptic number.

It is an amenable number.

2781629 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781629 is an equidigital number, since it uses as much as digits as its factorization.

2781629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 2781629 is about 1667.8216331491. The cubic root of 2781629 is about 140.6370458159.

The spelling of 2781629 in words is "two million, seven hundred eighty-one thousand, six hundred twenty-nine".