149771 has 2 divisors, whose sum is σ = 149772. Its totient is φ = 149770.

The previous prime is 149767. The next prime is 149791. The reversal of 149771 is 177941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 149771 - 2² = 149767 is a prime.

It is not a weakly prime, because it can be changed into another prime (149711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74885 + 74886.

It is an arithmetic number, because the mean of its divisors is an integer number (74886).

2¹⁴⁹⁷⁷¹ is an apocalyptic number.

149771 is a deficient number, since it is larger than the sum of its proper divisors (1).

149771 is an equidigital number, since it uses as much as digits as its factorization.

149771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 29.

The square root of 149771 is about 387.0025839707. The cubic root of 149771 is about 53.1058759308.

The spelling of 149771 in words is "one hundred forty-nine thousand, seven hundred seventy-one".