161338319 has 2 divisors, whose sum is σ = 161338320. Its totient is φ = 161338318.

The previous prime is 161338301. The next prime is 161338361. The reversal of 161338319 is 913833161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161338319 - 2²⁴ = 144561103 is a prime.

It is a super-2 number, since 2×161338319² = 52060106355491522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161331319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80669159 + 80669160.

It is an arithmetic number, because the mean of its divisors is an integer number (80669160).

Almost surely, 2^161338319 is an apocalyptic number.

161338319 is a deficient number, since it is larger than the sum of its proper divisors (1).

161338319 is an equidigital number, since it uses as much as digits as its factorization.

161338319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 161338319 is about 12701.9021803823. The cubic root of 161338319 is about 544.3929711329.

The spelling of 161338319 in words is "one hundred sixty-one million, three hundred thirty-eight thousand, three hundred nineteen".