162081793 has 4 divisors (see below), whose sum is σ = 166462420. Its totient is φ = 157701168.

The previous prime is 162081779. The next prime is 162081809. The reversal of 162081793 is 397180261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 397180261 = 23 ⋅17268707.

It can be written as a sum of positive squares in 2 ways, for example, as 90307009 + 71774784 = 9503^2 + 8472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162081793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 4380589 = 162081793 / (1 + 6 + 2 + 0 + 8 + 1 + 7 + 9 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162061793) 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, 2190258 + ... + 2190331.

It is an arithmetic number, because the mean of its divisors is an integer number (41615605).

Almost surely, 2^162081793 is an apocalyptic number.

It is an amenable number.

162081793 is a deficient number, since it is larger than the sum of its proper divisors (4380627).

162081793 is an equidigital number, since it uses as much as digits as its factorization.

162081793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380626.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 162081793 is about 12731.1347883839. The cubic root of 162081793 is about 545.2279079347.

The spelling of 162081793 in words is "one hundred sixty-two million, eighty-one thousand, seven hundred ninety-three".