1780481 has 2 divisors, whose sum is σ = 1780482. Its totient is φ = 1780480.

The previous prime is 1780469. The next prime is 1780483. The reversal of 1780481 is 1840871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1032256 + 748225 = 1016^2 + 865^2 .

It is an emirp because it is prime and its reverse (1840871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1780481 - 2¹⁰ = 1779457 is a prime.

It is a super-2 number, since 2×1780481² = 6340225182722, which contains 22 as substring.

Together with 1780483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1780483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890240 + 890241.

It is an arithmetic number, because the mean of its divisors is an integer number (890241).

2^1780481 is an apocalyptic number.

It is an amenable number.

1780481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780481 is an equidigital number, since it uses as much as digits as its factorization.

1780481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 1780481 is about 1334.3466566076. The cubic root of 1780481 is about 121.2027427700.

The spelling of 1780481 in words is "one million, seven hundred eighty thousand, four hundred eighty-one".