162641621 has 2 divisors, whose sum is σ = 162641622. Its totient is φ = 162641620.

The previous prime is 162641581. The next prime is 162641627. The reversal of 162641621 is 126146261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105472900 + 57168721 = 10270^2 + 7561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162641621 is a prime.

It is a super-3 number, since 3×162641621³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162641627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81320810 + 81320811.

It is an arithmetic number, because the mean of its divisors is an integer number (81320811).

Almost surely, 2^162641621 is an apocalyptic number.

It is an amenable number.

162641621 is a deficient number, since it is larger than the sum of its proper divisors (1).

162641621 is an equidigital number, since it uses as much as digits as its factorization.

162641621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 162641621 is about 12753.1024068656. The cubic root of 162641621 is about 545.8549228348.

Adding to 162641621 its reverse (126146261), we get a palindrome (288787882).

The spelling of 162641621 in words is "one hundred sixty-two million, six hundred forty-one thousand, six hundred twenty-one".