1180721 has 2 divisors, whose sum is σ = 1180722. Its totient is φ = 1180720.

The previous prime is 1180709. The next prime is 1180723. The reversal of 1180721 is 1270811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 57121 = 1060^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1180721 - 2⁶ = 1180657 is a prime.

Together with 1180723, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1180693 and 1180702.

It is not a weakly prime, because it can be changed into another prime (1180723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590360 + 590361.

It is an arithmetic number, because the mean of its divisors is an integer number (590361).

2^1180721 is an apocalyptic number.

It is an amenable number.

1180721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1180721 is an equidigital number, since it uses as much as digits as its factorization.

1180721 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 1180721 is about 1086.6098655911. The cubic root of 1180721 is about 105.6936986416.

The spelling of 1180721 in words is "one million, one hundred eighty thousand, seven hundred twenty-one".