162641021 has 2 divisors, whose sum is σ = 162641022. Its totient is φ = 162641020.

The previous prime is 162640999. The next prime is 162641051. The reversal of 162641021 is 120146261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 33477796 = 11365^2 + 5786^2 .

It is a cyclic number.

It is not a de Polignac number, because 162641021 - 2¹⁸ = 162378877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162641051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81320510 + 81320511.

It is an arithmetic number, because the mean of its divisors is an integer number (81320511).

Almost surely, 2^162641021 is an apocalyptic number.

It is an amenable number.

162641021 is a deficient number, since it is larger than the sum of its proper divisors (1).

162641021 is an equidigital number, since it uses as much as digits as its factorization.

162641021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 162641021 is about 12753.0788831560. The cubic root of 162641021 is about 545.8542515975.

Adding to 162641021 its reverse (120146261), we get a palindrome (282787282).

The spelling of 162641021 in words is "one hundred sixty-two million, six hundred forty-one thousand, twenty-one".