162401621 has 4 divisors (see below), whose sum is σ = 166790892. Its totient is φ = 158012352.

The previous prime is 162401611. The next prime is 162401633. The reversal of 162401621 is 126104261.

162401621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126104261 = 919 ⋅137219.

It can be written as a sum of positive squares in 2 ways, for example, as 154728721 + 7672900 = 12439^2 + 2770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162401621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162401611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2194580 + ... + 2194653.

It is an arithmetic number, because the mean of its divisors is an integer number (41697723).

Almost surely, 2^162401621 is an apocalyptic number.

It is an amenable number.

162401621 is a deficient number, since it is larger than the sum of its proper divisors (4389271).

162401621 is an equidigital number, since it uses as much as digits as its factorization.

162401621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4389270.

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

The square root of 162401621 is about 12743.6894579239. The cubic root of 162401621 is about 545.5862960789.

Adding to 162401621 its reverse (126104261), we get a palindrome (288505882).

The spelling of 162401621 in words is "one hundred sixty-two million, four hundred one thousand, six hundred twenty-one".