149661871 has 2 divisors, whose sum is σ = 149661872. Its totient is φ = 149661870.

The previous prime is 149661847. The next prime is 149661913. The reversal of 149661871 is 178166941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 149661871 - 2⁵ = 149661839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149661821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74830935 + 74830936.

It is an arithmetic number, because the mean of its divisors is an integer number (74830936).

Almost surely, 2^149661871 is an apocalyptic number.

149661871 is a deficient number, since it is larger than the sum of its proper divisors (1).

149661871 is an equidigital number, since it uses as much as digits as its factorization.

149661871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 149661871 is about 12233.6368672607. The cubic root of 149661871 is about 530.9297445836.

It can be divided in two parts, 149661 and 871, that multiplied together give a triangular number (130354731 = T₁₆₁₄₆).

The spelling of 149661871 in words is "one hundred forty-nine million, six hundred sixty-one thousand, eight hundred seventy-one".