149561971 has 8 divisors (see below), whose sum is σ = 170541504. Its totient is φ = 129936000.

The previous prime is 149561957. The next prime is 149561987. The reversal of 149561971 is 179165941.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 149561971 - 2¹⁵ = 149529203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149561471) 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 7 ways as a sum of consecutive naturals, for example, 338155 + ... + 338596.

It is an arithmetic number, because the mean of its divisors is an integer number (21317688).

Almost surely, 2^149561971 is an apocalyptic number.

149561971 is a deficient number, since it is larger than the sum of its proper divisors (20979533).

149561971 is a wasteful number, since it uses less digits than its factorization.

149561971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676781.

The product of its digits is 68040, while the sum is 43.

The square root of 149561971 is about 12229.5531807176. The cubic root of 149561971 is about 530.8115855919.

The spelling of 149561971 in words is "one hundred forty-nine million, five hundred sixty-one thousand, nine hundred seventy-one".