149842681 has 8 divisors (see below), whose sum is σ = 155380680. Its totient is φ = 144329472.

The previous prime is 149842673. The next prime is 149842699. The reversal of 149842681 is 186248941.

It can be written as a sum of positive squares in 4 ways, for example, as 19882681 + 129960000 = 4459^2 + 11400^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 149842681 - 2³ = 149842673 is a prime.

It is a super-2 number, since 2×149842681² = 44905658098535522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149842621) 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 7 ways as a sum of consecutive naturals, for example, 6591 + ... + 18523.

It is an arithmetic number, because the mean of its divisors is an integer number (19422585).

Almost surely, 2^149842681 is an apocalyptic number.

It is an amenable number.

149842681 is a deficient number, since it is larger than the sum of its proper divisors (5537999).

149842681 is a wasteful number, since it uses less digits than its factorization.

149842681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12395.

The product of its digits is 110592, while the sum is 43.

The square root of 149842681 is about 12241.0245077771. The cubic root of 149842681 is about 531.1434680780.

The spelling of 149842681 in words is "one hundred forty-nine million, eight hundred forty-two thousand, six hundred eighty-one".