1120781 has 2 divisors, whose sum is σ = 1120782. Its totient is φ = 1120780.

The previous prime is 1120771. The next prime is 1120783. The reversal of 1120781 is 1870211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828100 + 292681 = 910^2 + 541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1120781 is a prime.

It is a super-2 number, since 2×1120781² = 2512300099922, which contains 22 as substring.

Together with 1120783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1120783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560390 + 560391.

It is an arithmetic number, because the mean of its divisors is an integer number (560391).

2^1120781 is an apocalyptic number.

It is an amenable number.

1120781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1120781 is an equidigital number, since it uses as much as digits as its factorization.

1120781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1120781 is about 1058.6694479393. The cubic root of 1120781 is about 103.8740153444.

Adding to 1120781 its reverse (1870211), we get a palindrome (2990992).

The spelling of 1120781 in words is "one million, one hundred twenty thousand, seven hundred eighty-one".