149939381 has 4 divisors (see below), whose sum is σ = 149971500. Its totient is φ = 149907264.

The previous prime is 149939351. The next prime is 149939401. The reversal of 149939381 is 183939941.

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 24700900 + 125238481 = 4970^2 + 11191^2 .

It is a cyclic number.

It is not a de Polignac number, because 149939381 - 2¹⁸ = 149677237 is a prime.

It is a super-2 number, since 2×149939381² = 44963635949326322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149939311) 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 3 ways as a sum of consecutive naturals, for example, 7556 + ... + 18893.

It is an arithmetic number, because the mean of its divisors is an integer number (37492875).

Almost surely, 2^149939381 is an apocalyptic number.

It is an amenable number.

149939381 is a deficient number, since it is larger than the sum of its proper divisors (32119).

149939381 is an equidigital number, since it uses as much as digits as its factorization.

149939381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32118.

The product of its digits is 209952, while the sum is 47.

The square root of 149939381 is about 12244.9737035242. The cubic root of 149939381 is about 531.2577001698.

The spelling of 149939381 in words is "one hundred forty-nine million, nine hundred thirty-nine thousand, three hundred eighty-one".