149691323 has 4 divisors (see below), whose sum is σ = 149811480. Its totient is φ = 149571168.

The previous prime is 149691317. The next prime is 149691331. The reversal of 149691323 is 323196941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323196941 = 709 ⋅455849.

It is a cyclic number.

It is not a de Polignac number, because 149691323 - 2⁸ = 149691067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149691313) 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, 58190 + ... + 60707.

It is an arithmetic number, because the mean of its divisors is an integer number (37452870).

Almost surely, 2^149691323 is an apocalyptic number.

149691323 is a deficient number, since it is larger than the sum of its proper divisors (120157).

149691323 is a wasteful number, since it uses less digits than its factorization.

149691323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120156.

The product of its digits is 34992, while the sum is 38.

The square root of 149691323 is about 12234.8405383969. The cubic root of 149691323 is about 530.9645695685.

The spelling of 149691323 in words is "one hundred forty-nine million, six hundred ninety-one thousand, three hundred twenty-three".