149991147 has 24 divisors (see below), whose sum is σ = 222942720. Its totient is φ = 97124400.

The previous prime is 149991139. The next prime is 149991151. The reversal of 149991147 is 741199941.

It is not a de Polignac number, because 149991147 - 2³ = 149991139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (149991047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57522 + ... + 60072.

It is an arithmetic number, because the mean of its divisors is an integer number (9289280).

Almost surely, 2^149991147 is an apocalyptic number.

149991147 is a deficient number, since it is larger than the sum of its proper divisors (72951573).

149991147 is a wasteful number, since it uses less digits than its factorization.

149991147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743 (or 2740 counting only the distinct ones).

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

The square root of 149991147 is about 12247.0872863714. The cubic root of 149991147 is about 531.3188313675.

The spelling of 149991147 in words is "one hundred forty-nine million, nine hundred ninety-one thousand, one hundred forty-seven".