170721041 has 2 divisors, whose sum is σ = 170721042. Its totient is φ = 170721040.

The previous prime is 170721013. The next prime is 170721059. The reversal of 170721041 is 140127071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161290000 + 9431041 = 12700^2 + 3071^2 .

It is a cyclic number.

It is not a de Polignac number, because 170721041 - 2²⁶ = 103612177 is a prime.

It is equal to p_9541121 and since 170721041 and 9541121 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 170720998 and 170721016.

It is not a weakly prime, because it can be changed into another prime (170721011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85360520 + 85360521.

It is an arithmetic number, because the mean of its divisors is an integer number (85360521).

Almost surely, 2^170721041 is an apocalyptic number.

It is an amenable number.

170721041 is a deficient number, since it is larger than the sum of its proper divisors (1).

170721041 is an equidigital number, since it uses as much as digits as its factorization.

170721041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 170721041 is about 13066.0262130458. The cubic root of 170721041 is about 554.7479211272.

The spelling of 170721041 in words is "one hundred seventy million, seven hundred twenty-one thousand, forty-one".