145782181 has 8 divisors (see below), whose sum is σ = 150796800. Its totient is φ = 140787120.

The previous prime is 145782163. The next prime is 145782187. The reversal of 145782181 is 181287541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145782181 - 2¹³ = 145773989 is a prime.

It is a super-2 number, since 2×145782181² = 42504888594233522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145782181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145782187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11160 + ... + 20398.

It is an arithmetic number, because the mean of its divisors is an integer number (18849600).

Almost surely, 2^145782181 is an apocalyptic number.

It is an amenable number.

145782181 is a deficient number, since it is larger than the sum of its proper divisors (5014619).

145782181 is an equidigital number, since it uses as much as digits as its factorization.

145782181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9779.

The product of its digits is 17920, while the sum is 37.

The square root of 145782181 is about 12074.0291949291. The cubic root of 145782181 is about 526.3017504113.

It can be divided in two parts, 1457 and 82181, that added together give a palindrome (83638).

The spelling of 145782181 in words is "one hundred forty-five million, seven hundred eighty-two thousand, one hundred eighty-one".