149840181 has 6 divisors (see below), whose sum is σ = 216435830. Its totient is φ = 99893448.

The previous prime is 149840161. The next prime is 149840189. The reversal of 149840181 is 181048941.

149840181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 135140625 + 14699556 = 11625^2 + 3834^2 .

It is a de Polignac number, because none of the positive numbers 2^k-149840181 is a prime.

It is a super-2 number, since 2×149840181² = 44904159684225522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149840189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8324446 + ... + 8324463.

Almost surely, 2^149840181 is an apocalyptic number.

It is an amenable number.

149840181 is a deficient number, since it is larger than the sum of its proper divisors (66595649).

149840181 is a wasteful number, since it uses less digits than its factorization.

149840181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16648915 (or 16648912 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 149840181 is about 12240.9223917154. The cubic root of 149840181 is about 531.1405141665.

The spelling of 149840181 in words is "one hundred forty-nine million, eight hundred forty thousand, one hundred eighty-one".