149806081 has 4 divisors (see below), whose sum is σ = 153854932. Its totient is φ = 145757232.

The previous prime is 149806079. The next prime is 149806117. The reversal of 149806081 is 180608941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116640000 + 33166081 = 10800^2 + 5759^2 .

It is a cyclic number.

It is not a de Polignac number, because 149806081 - 2¹ = 149806079 is a prime.

It is a super-2 number, since 2×149806081² = 44883723809157122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 4048813 = 149806081 / (1 + 4 + 9 + 8 + 0 + 6 + 0 + 8 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 149806081.

It is not an unprimeable number, because it can be changed into a prime (149806381) 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 3 ways as a sum of consecutive naturals, for example, 2024370 + ... + 2024443.

It is an arithmetic number, because the mean of its divisors is an integer number (38463733).

Almost surely, 2^149806081 is an apocalyptic number.

It is an amenable number.

149806081 is a deficient number, since it is larger than the sum of its proper divisors (4048851).

149806081 is an equidigital number, since it uses as much as digits as its factorization.

149806081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4048850.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 149806081 is about 12239.5294435693. The cubic root of 149806081 is about 531.1002195327.

The spelling of 149806081 in words is "one hundred forty-nine million, eight hundred six thousand, eighty-one".