162749009 has 2 divisors, whose sum is σ = 162749010. Its totient is φ = 162749008.

The previous prime is 162748981. The next prime is 162749011. The reversal of 162749009 is 900947261.

162749009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138768400 + 23980609 = 11780^2 + 4897^2 .

It is an emirp because it is prime and its reverse (900947261) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162749009 is a prime.

Together with 162749011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (162749089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81374504 + 81374505.

It is an arithmetic number, because the mean of its divisors is an integer number (81374505).

Almost surely, 2^162749009 is an apocalyptic number.

It is an amenable number.

162749009 is a deficient number, since it is larger than the sum of its proper divisors (1).

162749009 is an equidigital number, since it uses as much as digits as its factorization.

162749009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 162749009 is about 12757.3119817617. The cubic root of 162749009 is about 545.9750343033.

The spelling of 162749009 in words is "one hundred sixty-two million, seven hundred forty-nine thousand, nine".