149691 has 8 divisors (see below), whose sum is σ = 204624. Its totient is φ = 97280.

The previous prime is 149689. The next prime is 149711. The reversal of 149691 is 196941.

149691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 149691 - 2¹ = 149689 is a prime.

149691 is a lucky number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (149491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486 + ... + 731.

It is an arithmetic number, because the mean of its divisors is an integer number (25578).

2¹⁴⁹⁶⁹¹ is an apocalyptic number.

149691 is a deficient number, since it is larger than the sum of its proper divisors (54933).

149691 is a wasteful number, since it uses less digits than its factorization.

149691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261.

The product of its digits is 1944, while the sum is 30.

The square root of 149691 is about 386.8992116818. The cubic root of 149691 is about 53.0964187668.

The spelling of 149691 in words is "one hundred forty-nine thousand, six hundred ninety-one".