149272181 has 4 divisors (see below), whose sum is σ = 151500192. Its totient is φ = 147044172.

The previous prime is 149272177. The next prime is 149272187. The reversal of 149272181 is 181272941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 149272181 - 2² = 149272177 is a prime.

It is a super-2 number, since 2×149272181² = 44564368040993522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149272187) 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, 1113905 + ... + 1114038.

It is an arithmetic number, because the mean of its divisors is an integer number (37875048).

Almost surely, 2^149272181 is an apocalyptic number.

It is an amenable number.

149272181 is a deficient number, since it is larger than the sum of its proper divisors (2228011).

149272181 is an equidigital number, since it uses as much as digits as its factorization.

149272181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228010.

The product of its digits is 8064, while the sum is 35.

The square root of 149272181 is about 12217.6994970412. The cubic root of 149272181 is about 530.4685319294.

The spelling of 149272181 in words is "one hundred forty-nine million, two hundred seventy-two thousand, one hundred eighty-one".