149601823 has 4 divisors (see below), whose sum is σ = 170973520. Its totient is φ = 128230128.

The previous prime is 149601797. The next prime is 149601833. The reversal of 149601823 is 328106941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328106941 = 53 ⋅6190697.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149601823 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 (149601833) 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, 10685838 + ... + 10685851.

It is an arithmetic number, because the mean of its divisors is an integer number (42743380).

Almost surely, 2^149601823 is an apocalyptic number.

149601823 is a deficient number, since it is larger than the sum of its proper divisors (21371697).

149601823 is an equidigital number, since it uses as much as digits as its factorization.

149601823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21371696.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 149601823 is about 12231.1824040033. The cubic root of 149601823 is about 530.8587277555.

The spelling of 149601823 in words is "one hundred forty-nine million, six hundred one thousand, eight hundred twenty-three".