171478973 has 2 divisors, whose sum is σ = 171478974. Its totient is φ = 171478972.

The previous prime is 171478907. The next prime is 171478997. The reversal of 171478973 is 379874171.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171034084 + 444889 = 13078^2 + 667^2 .

It is an emirp because it is prime and its reverse (379874171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171478973 - 2⁸ = 171478717 is a prime.

It is a super-2 number, since 2×171478973² = 58810076362269458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171478273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85739486 + 85739487.

It is an arithmetic number, because the mean of its divisors is an integer number (85739487).

Almost surely, 2^171478973 is an apocalyptic number.

It is an amenable number.

171478973 is a deficient number, since it is larger than the sum of its proper divisors (1).

171478973 is an equidigital number, since it uses as much as digits as its factorization.

171478973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 47.

The square root of 171478973 is about 13094.9980145092. The cubic root of 171478973 is about 555.5676609466.

The spelling of 171478973 in words is "one hundred seventy-one million, four hundred seventy-eight thousand, nine hundred seventy-three".