1102721 has 2 divisors, whose sum is σ = 1102722. Its totient is φ = 1102720.

The previous prime is 1102709. The next prime is 1102727. The reversal of 1102721 is 1272011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 132496 = 985^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1102721 - 2¹⁰ = 1101697 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1102696 and 1102705.

It is not a weakly prime, because it can be changed into another prime (1102727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551360 + 551361.

It is an arithmetic number, because the mean of its divisors is an integer number (551361).

2^1102721 is an apocalyptic number.

It is an amenable number.

1102721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1102721 is an equidigital number, since it uses as much as digits as its factorization.

1102721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 1102721 is about 1050.1052328219. The cubic root of 1102721 is about 103.3130576475.

Adding to 1102721 its reverse (1272011), we get a palindrome (2374732).

The spelling of 1102721 in words is "one million, one hundred two thousand, seven hundred twenty-one".