161871313 has 2 divisors, whose sum is σ = 161871314. Its totient is φ = 161871312.

The previous prime is 161871293. The next prime is 161871319. The reversal of 161871313 is 313178161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140968129 + 20903184 = 11873^2 + 4572^2 .

It is a cyclic number.

It is not a de Polignac number, because 161871313 - 2⁹ = 161870801 is a prime.

It is not a weakly prime, because it can be changed into another prime (161871319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80935656 + 80935657.

It is an arithmetic number, because the mean of its divisors is an integer number (80935657).

Almost surely, 2^161871313 is an apocalyptic number.

It is an amenable number.

161871313 is a deficient number, since it is larger than the sum of its proper divisors (1).

161871313 is an equidigital number, since it uses as much as digits as its factorization.

161871313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 161871313 is about 12722.8657542238. The cubic root of 161871313 is about 544.9917940576.

The spelling of 161871313 in words is "one hundred sixty-one million, eight hundred seventy-one thousand, three hundred thirteen".