162489721 has 2 divisors, whose sum is σ = 162489722. Its totient is φ = 162489720.

The previous prime is 162489713. The next prime is 162489727. The reversal of 162489721 is 127984261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120758121 + 41731600 = 10989^2 + 6460^2 .

It is a cyclic number.

It is not a de Polignac number, because 162489721 - 2³ = 162489713 is a prime.

It is not a weakly prime, because it can be changed into another prime (162489727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81244860 + 81244861.

It is an arithmetic number, because the mean of its divisors is an integer number (81244861).

Almost surely, 2^162489721 is an apocalyptic number.

It is an amenable number.

162489721 is a deficient number, since it is larger than the sum of its proper divisors (1).

162489721 is an equidigital number, since it uses as much as digits as its factorization.

162489721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 162489721 is about 12747.1456020554. The cubic root of 162489721 is about 545.6849352085.

The spelling of 162489721 in words is "one hundred sixty-two million, four hundred eighty-nine thousand, seven hundred twenty-one".