149549639 has 4 divisors (see below), whose sum is σ = 149611080. Its totient is φ = 149488200.

The previous prime is 149549599. The next prime is 149549651. The reversal of 149549639 is 936945941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936945941 = 113 ⋅8291557.

It is a cyclic number.

It is not a de Polignac number, because 149549639 - 2⁸ = 149549383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149549689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26912 + ... + 31989.

It is an arithmetic number, because the mean of its divisors is an integer number (37402770).

Almost surely, 2^149549639 is an apocalyptic number.

149549639 is a deficient number, since it is larger than the sum of its proper divisors (61441).

149549639 is an equidigital number, since it uses as much as digits as its factorization.

149549639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61440.

The product of its digits is 1049760, while the sum is 50.

The square root of 149549639 is about 12229.0489818301. The cubic root of 149549639 is about 530.7969959910.

The spelling of 149549639 in words is "one hundred forty-nine million, five hundred forty-nine thousand, six hundred thirty-nine".