145322181 has 20 divisors (see below), whose sum is σ = 219021132. Its totient is φ = 96018048.

The previous prime is 145322173. The next prime is 145322267. The reversal of 145322181 is 181223541.

It can be written as a sum of positive squares in 2 ways, for example, as 81162081 + 64160100 = 9009^2 + 8010^2 .

It is not a de Polignac number, because 145322181 - 2³ = 145322173 is a prime.

It is a super-2 number, since 2×145322181² = 42237072581193522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145322101) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1215 + ... + 17091.

Almost surely, 2^145322181 is an apocalyptic number.

It is an amenable number.

145322181 is a deficient number, since it is larger than the sum of its proper divisors (73698951).

145322181 is a wasteful number, since it uses less digits than its factorization.

145322181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16002 (or 15993 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 145322181 is about 12054.9649937277. The cubic root of 145322181 is about 525.7476042878.

The spelling of 145322181 in words is "one hundred forty-five million, three hundred twenty-two thousand, one hundred eighty-one".