1107721 has 2 divisors, whose sum is σ = 1107722. Its totient is φ = 1107720.

The previous prime is 1107679. The next prime is 1107727. The reversal of 1107721 is 1277011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 978121 + 129600 = 989^2 + 360^2 .

It is an emirp because it is prime and its reverse (1277011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1107721 - 2⁷ = 1107593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1107727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 553860 + 553861.

It is an arithmetic number, because the mean of its divisors is an integer number (553861).

2^1107721 is an apocalyptic number.

It is an amenable number.

1107721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1107721 is an equidigital number, since it uses as much as digits as its factorization.

1107721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 1107721 is about 1052.4832540235. The cubic root of 1107721 is about 103.4689709158.

The spelling of 1107721 in words is "one million, one hundred seven thousand, seven hundred twenty-one".