170981311 has 2 divisors, whose sum is σ = 170981312. Its totient is φ = 170981310.

The previous prime is 170981273. The next prime is 170981381. The reversal of 170981311 is 113189071.

It is a weak prime.

It is an emirp because it is prime and its reverse (113189071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170981311 - 2¹³ = 170973119 is a prime.

It is a super-2 number, since 2×170981311² = 58469217422557442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170981381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85490655 + 85490656.

It is an arithmetic number, because the mean of its divisors is an integer number (85490656).

Almost surely, 2^170981311 is an apocalyptic number.

170981311 is a deficient number, since it is larger than the sum of its proper divisors (1).

170981311 is an equidigital number, since it uses as much as digits as its factorization.

170981311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 31.

The square root of 170981311 is about 13075.9822193210. The cubic root of 170981311 is about 555.0296886426.

The spelling of 170981311 in words is "one hundred seventy million, nine hundred eighty-one thousand, three hundred eleven".