149689 has 2 divisors, whose sum is σ = 149690. Its totient is φ = 149688.

The previous prime is 149629. The next prime is 149711. The reversal of 149689 is 986941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 71289 = 280^2 + 267^2 .

It is an emirp because it is prime and its reverse (986941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149689 - 2⁷ = 149561 is a prime.

It is not a weakly prime, because it can be changed into another prime (149629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74844 + 74845.

It is an arithmetic number, because the mean of its divisors is an integer number (74845).

2¹⁴⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

149689 is a deficient number, since it is larger than the sum of its proper divisors (1).

149689 is an equidigital number, since it uses as much as digits as its factorization.

149689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 149689 is about 386.8966270207. The cubic root of 149689 is about 53.0961822945.

It can be divided in two parts, 149 and 689, that added together give a palindrome (838).

The spelling of 149689 in words is "one hundred forty-nine thousand, six hundred eighty-nine".