165228331 has 2 divisors, whose sum is σ = 165228332. Its totient is φ = 165228330.

The previous prime is 165228311. The next prime is 165228353. The reversal of 165228331 is 133822561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165228331 - 2⁵ = 165228299 is a prime.

It is a super-2 number, since 2×165228331² = 54600802730091122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 165228293 and 165228302.

It is not a weakly prime, because it can be changed into another prime (165228311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82614165 + 82614166.

It is an arithmetic number, because the mean of its divisors is an integer number (82614166).

Almost surely, 2^165228331 is an apocalyptic number.

165228331 is a deficient number, since it is larger than the sum of its proper divisors (1).

165228331 is an equidigital number, since it uses as much as digits as its factorization.

165228331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 165228331 is about 12854.1172781331. The cubic root of 165228331 is about 548.7335389060.

The spelling of 165228331 in words is "one hundred sixty-five million, two hundred twenty-eight thousand, three hundred thirty-one".