1170721 has 2 divisors, whose sum is σ = 1170722. Its totient is φ = 1170720.

The previous prime is 1170713. The next prime is 1170727. The reversal of 1170721 is 1270711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 130321 = 1020^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1170721 - 2³ = 1170713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1170727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585360 + 585361.

It is an arithmetic number, because the mean of its divisors is an integer number (585361).

2^1170721 is an apocalyptic number.

It is an amenable number.

1170721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1170721 is an equidigital number, since it uses as much as digits as its factorization.

1170721 is an evil number, because the sum of its binary digits is even.

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

The square root of 1170721 is about 1081.9986136775. The cubic root of 1170721 is about 105.3944648174.

It can be divided in two parts, 1170 and 721, that added together give a triangular number (1891 = T₆₁).

The spelling of 1170721 in words is "one million, one hundred seventy thousand, seven hundred twenty-one".