149621 has 4 divisors (see below), whose sum is σ = 150732. Its totient is φ = 148512.

The previous prime is 149603. The next prime is 149623. The reversal of 149621 is 126941.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 126941 = 61 ⋅2081.

It can be written as a sum of positive squares in 2 ways, for example, as 52900 + 96721 = 230^2 + 311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149621 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 (149623) 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, 320 + ... + 633.

It is an arithmetic number, because the mean of its divisors is an integer number (37683).

2¹⁴⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

149621 is a deficient number, since it is larger than the sum of its proper divisors (1111).

149621 is an equidigital number, since it uses as much as digits as its factorization.

149621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110.

The product of its digits is 432, while the sum is 23.

The square root of 149621 is about 386.8087382674. The cubic root of 149621 is about 53.0881409838.

It can be divided in two parts, 149 and 621, that multiplied together give a palindrome (92529).

The spelling of 149621 in words is "one hundred forty-nine thousand, six hundred twenty-one".