149999971 has 4 divisors (see below), whose sum is σ = 163636344. Its totient is φ = 136363600.

The previous prime is 149999957. The next prime is 150000001. The reversal of 149999971 is 179999941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 149999971 - 2⁹ = 149999459 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (149999071) 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 3 ways as a sum of consecutive naturals, for example, 6818170 + ... + 6818191.

It is an arithmetic number, because the mean of its divisors is an integer number (40909086).

Almost surely, 2^149999971 is an apocalyptic number.

149999971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

149999971 is a deficient number, since it is larger than the sum of its proper divisors (13636373).

149999971 is a wasteful number, since it uses less digits than its factorization.

149999971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13636372.

The product of its digits is 1653372, while the sum is 58.

The square root of 149999971 is about 12247.4475299958. The cubic root of 149999971 is about 531.3292503501.

The spelling of 149999971 in words is "one hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-one".