1670281 has 2 divisors, whose sum is σ = 1670282. Its totient is φ = 1670280.

The previous prime is 1670269. The next prime is 1670287. The reversal of 1670281 is 1820761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1666681 + 3600 = 1291^2 + 60^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1670281 is a prime.

It is a super-2 number, since 2×1670281² = 5579677237922, which contains 22 as substring.

1670281 is a lucky number.

It is a nialpdrome in base 6.

It is not a weakly prime, because it can be changed into another prime (1670287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835140 + 835141.

It is an arithmetic number, because the mean of its divisors is an integer number (835141).

2^1670281 is an apocalyptic number.

It is an amenable number.

1670281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670281 is an equidigital number, since it uses as much as digits as its factorization.

1670281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1670281 is about 1292.3935159231. The cubic root of 1670281 is about 118.6487535909.

The spelling of 1670281 in words is "one million, six hundred seventy thousand, two hundred eighty-one".