170820479 has 2 divisors, whose sum is σ = 170820480. Its totient is φ = 170820478.

The previous prime is 170820449. The next prime is 170820497. The reversal of 170820479 is 974028071.

Together with next prime (170820497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170820479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170820449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85410239 + 85410240.

It is an arithmetic number, because the mean of its divisors is an integer number (85410240).

Almost surely, 2^170820479 is an apocalyptic number.

170820479 is a deficient number, since it is larger than the sum of its proper divisors (1).

170820479 is an equidigital number, since it uses as much as digits as its factorization.

170820479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 170820479 is about 13069.8308711322. The cubic root of 170820479 is about 554.8556061883.

The spelling of 170820479 in words is "one hundred seventy million, eight hundred twenty thousand, four hundred seventy-nine".