149178643 has 4 divisors (see below), whose sum is σ = 149302440. Its totient is φ = 149054848.

The previous prime is 149178641. The next prime is 149178647. The reversal of 149178643 is 346871941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346871941 = 13 ⋅26682457.

It is a cyclic number.

It is not a de Polignac number, because 149178643 - 2¹ = 149178641 is a prime.

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 149178643.

It is not an unprimeable number, because it can be changed into a prime (149178641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60073 + ... + 62506.

It is an arithmetic number, because the mean of its divisors is an integer number (37325610).

Almost surely, 2^149178643 is an apocalyptic number.

149178643 is a deficient number, since it is larger than the sum of its proper divisors (123797).

149178643 is a wasteful number, since it uses less digits than its factorization.

149178643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123796.

The product of its digits is 145152, while the sum is 43.

The square root of 149178643 is about 12213.8709261233. The cubic root of 149178643 is about 530.3577067843.

The spelling of 149178643 in words is "one hundred forty-nine million, one hundred seventy-eight thousand, six hundred forty-three".