126649 has 4 divisors (see below), whose sum is σ = 129780. Its totient is φ = 123520.

The previous prime is 126641. The next prime is 126653. The reversal of 126649 is 946621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946621 = 13 ⋅72817.

It can be written as a sum of positive squares in 2 ways, for example, as 59049 + 67600 = 243^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 126649 - 2³ = 126641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126641) 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, 1504 + ... + 1585.

It is an arithmetic number, because the mean of its divisors is an integer number (32445).

2¹²⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

126649 is a deficient number, since it is larger than the sum of its proper divisors (3131).

126649 is an equidigital number, since it uses as much as digits as its factorization.

126649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130.

The product of its digits is 2592, while the sum is 28.

The square root of 126649 is about 355.8777880116. The cubic root of 126649 is about 50.2189068637.

Subtracting from 126649 its sum of digits (28), we obtain a palindrome (126621).

The spelling of 126649 in words is "one hundred twenty-six thousand, six hundred forty-nine".