1629281 has 2 divisors, whose sum is σ = 1629282. Its totient is φ = 1629280.

The previous prime is 1629259. The next prime is 1629293. The reversal of 1629281 is 1829261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 341056 = 1135^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 1629281 - 2¹⁸ = 1367137 is a prime.

It is a super-2 number, since 2×1629281² = 5309113153922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1629211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814640 + 814641.

It is an arithmetic number, because the mean of its divisors is an integer number (814641).

2^1629281 is an apocalyptic number.

It is an amenable number.

1629281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1629281 is an equidigital number, since it uses as much as digits as its factorization.

1629281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 1629281 is about 1276.4329202900. The cubic root of 1629281 is about 117.6698855364.

The spelling of 1629281 in words is "one million, six hundred twenty-nine thousand, two hundred eighty-one".