149181591 has 16 divisors (see below), whose sum is σ = 218254176. Its totient is φ = 90070656.

The previous prime is 149181589. The next prime is 149181623. The reversal of 149181591 is 195181941.

It is not a de Polignac number, because 149181591 - 2¹ = 149181589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149181541) 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 15 ways as a sum of consecutive naturals, for example, 34020 + ... + 38153.

It is an arithmetic number, because the mean of its divisors is an integer number (13640886).

Almost surely, 2^149181591 is an apocalyptic number.

149181591 is a deficient number, since it is larger than the sum of its proper divisors (69072585).

149181591 is a wasteful number, since it uses less digits than its factorization.

149181591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72242.

The product of its digits is 12960, while the sum is 39.

The square root of 149181591 is about 12213.9916079879. The cubic root of 149181591 is about 530.3612003233.

The spelling of 149181591 in words is "one hundred forty-nine million, one hundred eighty-one thousand, five hundred ninety-one".