149549805 has 18 divisors (see below), whose sum is σ = 259361934. Its totient is φ = 79716144.

The previous prime is 149549773. The next prime is 149549809. The reversal of 149549805 is 508945941.

It can be written as a sum of positive squares in only one way, i.e., 119639844 + 29909961 = 10938^2 + 5469^2 .

It is not a de Polignac number, because 149549805 - 2⁵ = 149549773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149549809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 81124 + ... + 82946.

Almost surely, 2^149549805 is an apocalyptic number.

149549805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

149549805 is a deficient number, since it is larger than the sum of its proper divisors (109812129).

149549805 is an frugal number, since it uses more digits than its factorization.

149549805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657 (or 1831 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 149549805 is about 12229.0557689463. The cubic root of 149549805 is about 530.7971923857.

Multiplying 149549805 by its sum of digits (45), we get a square (6729741225 = 82035²).

149549805 divided by its sum of digits (45) gives a square (3323329 = 1823²).

The spelling of 149549805 in words is "one hundred forty-nine million, five hundred forty-nine thousand, eight hundred five".