162688321 has 2 divisors, whose sum is σ = 162688322. Its totient is φ = 162688320.

The previous prime is 162688319. The next prime is 162688327. The reversal of 162688321 is 123886261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150185025 + 12503296 = 12255^2 + 3536^2 .

It is a cyclic number.

It is not a de Polignac number, because 162688321 - 2¹ = 162688319 is a prime.

Together with 162688319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (162688327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81344160 + 81344161.

It is an arithmetic number, because the mean of its divisors is an integer number (81344161).

Almost surely, 2^162688321 is an apocalyptic number.

It is an amenable number.

162688321 is a deficient number, since it is larger than the sum of its proper divisors (1).

162688321 is an equidigital number, since it uses as much as digits as its factorization.

162688321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 162688321 is about 12754.9332024907. The cubic root of 162688321 is about 545.9071624057.

The spelling of 162688321 in words is "one hundred sixty-two million, six hundred eighty-eight thousand, three hundred twenty-one".