149181921 has 36 divisors (see below), whose sum is σ = 256528272. Its totient is φ = 83253744.

The previous prime is 149181911. The next prime is 149181931. The reversal of 149181921 is 129181941.

149181921 is a `hidden beast` number, since 1 + 491 + 81 + 92 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (149181911) and next prime (149181931).

It is not a de Polignac number, because 149181921 - 2¹¹ = 149179873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (149181911) 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 35 ways as a sum of consecutive naturals, for example, 15030 + ... + 22896.

Almost surely, 2^149181921 is an apocalyptic number.

It is an amenable number.

149181921 is a deficient number, since it is larger than the sum of its proper divisors (107346351).

149181921 is a wasteful number, since it uses less digits than its factorization.

149181921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7930 (or 7920 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 149181921 is about 12214.0051170777. The cubic root of 149181921 is about 530.3615913882.

The spelling of 149181921 in words is "one hundred forty-nine million, one hundred eighty-one thousand, nine hundred twenty-one".