161886313 has 2 divisors, whose sum is σ = 161886314. Its totient is φ = 161886312.

The previous prime is 161886239. The next prime is 161886331. The reversal of 161886313 is 313688161.

Together with next prime (161886331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115605504 + 46280809 = 10752^2 + 6803^2 .

It is an emirp because it is prime and its reverse (313688161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161886313 - 2¹³ = 161878121 is a prime.

It is not a weakly prime, because it can be changed into another prime (161883313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80943156 + 80943157.

It is an arithmetic number, because the mean of its divisors is an integer number (80943157).

Almost surely, 2^161886313 is an apocalyptic number.

It is an amenable number.

161886313 is a deficient number, since it is larger than the sum of its proper divisors (1).

161886313 is an equidigital number, since it uses as much as digits as its factorization.

161886313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 161886313 is about 12723.4552304003. The cubic root of 161886313 is about 545.0086276445.

The spelling of 161886313 in words is "one hundred sixty-one million, eight hundred eighty-six thousand, three hundred thirteen".