162005891 has 2 divisors, whose sum is σ = 162005892. Its totient is φ = 162005890.

The previous prime is 162005867. The next prime is 162005923. The reversal of 162005891 is 198500261.

It is an a-pointer prime, because the next prime (162005923) can be obtained adding 162005891 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162005891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165005891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81002945 + 81002946.

It is an arithmetic number, because the mean of its divisors is an integer number (81002946).

Almost surely, 2^162005891 is an apocalyptic number.

162005891 is a deficient number, since it is larger than the sum of its proper divisors (1).

162005891 is an equidigital number, since it uses as much as digits as its factorization.

162005891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 162005891 is about 12728.1534795900. The cubic root of 162005891 is about 545.1427855828.

The spelling of 162005891 in words is "one hundred sixty-two million, five thousand, eight hundred ninety-one".