162151621 has 4 divisors (see below), whose sum is σ = 162470700. Its totient is φ = 161832544.

The previous prime is 162151589. The next prime is 162151631. The reversal of 162151621 is 126151261.

It is a happy number.

162151621 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: 126151261 = 523 ⋅241207.

It can be written as a sum of positive squares in 2 ways, for example, as 148498596 + 13653025 = 12186^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 162151621 - 2⁵ = 162151589 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 (162151631) 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, 158776 + ... + 159793.

It is an arithmetic number, because the mean of its divisors is an integer number (40617675).

Almost surely, 2^162151621 is an apocalyptic number.

It is an amenable number.

162151621 is a deficient number, since it is larger than the sum of its proper divisors (319079).

162151621 is an equidigital number, since it uses as much as digits as its factorization.

162151621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319078.

The product of its digits is 720, while the sum is 25.

The square root of 162151621 is about 12733.8769037556. The cubic root of 162151621 is about 545.3061949682.

The spelling of 162151621 in words is "one hundred sixty-two million, one hundred fifty-one thousand, six hundred twenty-one".