149992171 has 16 divisors (see below), whose sum is σ = 173896128. Its totient is φ = 126720000.

The previous prime is 149992159. The next prime is 149992187. The reversal of 149992171 is 171299941.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149992171 is a prime.

It is a super-2 number, since 2×149992171² = 44995302722586482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (149993171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249271 + ... + 249871.

It is an arithmetic number, because the mean of its divisors is an integer number (10868508).

Almost surely, 2^149992171 is an apocalyptic number.

149992171 is a deficient number, since it is larger than the sum of its proper divisors (23903957).

149992171 is a wasteful number, since it uses less digits than its factorization.

149992171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062.

The product of its digits is 40824, while the sum is 43.

The square root of 149992171 is about 12247.1290921587. The cubic root of 149992171 is about 531.3200404817.

The spelling of 149992171 in words is "one hundred forty-nine million, nine hundred ninety-two thousand, one hundred seventy-one".