149947191 has 12 divisors (see below), whose sum is σ = 229331232. Its totient is φ = 94084416.

The previous prime is 149947177. The next prime is 149947241. The reversal of 149947191 is 191749941.

149947191 is a `hidden beast` number, since 1 + 4 + 99 + 471 + 91 = 666.

It is not a de Polignac number, because 149947191 - 2¹¹ = 149945143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149947151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 489871 + ... + 490176.

It is an arithmetic number, because the mean of its divisors is an integer number (19110936).

Almost surely, 2^149947191 is an apocalyptic number.

149947191 is a deficient number, since it is larger than the sum of its proper divisors (79384041).

149947191 is a wasteful number, since it uses less digits than its factorization.

149947191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980070 (or 980067 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 149947191 is about 12245.2926057322. The cubic root of 149947191 is about 531.2669240099.

The spelling of 149947191 in words is "one hundred forty-nine million, nine hundred forty-seven thousand, one hundred ninety-one".