125553 has 4 divisors (see below), whose sum is σ = 167408. Its totient is φ = 83700.

The previous prime is 125551. The next prime is 125591. The reversal of 125553 is 355521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 125553 - 2¹ = 125551 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125551) 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, 20923 + ... + 20928.

It is an arithmetic number, because the mean of its divisors is an integer number (41852).

2¹²⁵⁵⁵³ is an apocalyptic number.

It is an amenable number.

125553 is a deficient number, since it is larger than the sum of its proper divisors (41855).

125553 is an equidigital number, since it uses as much as digits as its factorization.

125553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41854.

The product of its digits is 750, while the sum is 21.

The square root of 125553 is about 354.3345876428. The cubic root of 125553 is about 50.0736248677.

It can be divided in two parts, 12 and 5553, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 125553 in words is "one hundred twenty-five thousand, five hundred fifty-three".