124945 has 4 divisors (see below), whose sum is σ = 149940. Its totient is φ = 99952.

The previous prime is 124919. The next prime is 124951. The reversal of 124945 is 549421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96721 + 28224 = 311^2 + 168^2 .

It is a cyclic number.

It is not a de Polignac number, because 124945 - 2⁹ = 124433 is a prime.

It is a super-2 number, since 2×124945² = 31222506050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12490 + ... + 12499.

It is an arithmetic number, because the mean of its divisors is an integer number (37485).

2¹²⁴⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

124945 is a deficient number, since it is larger than the sum of its proper divisors (24995).

124945 is an equidigital number, since it uses as much as digits as its factorization.

124945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24994.

The product of its digits is 1440, while the sum is 25.

The square root of 124945 is about 353.4756002895. The cubic root of 124945 is about 49.9926655908.

It can be divided in two parts, 12 and 4945, that multiplied together give a triangular number (59340 = T₃₄₄).

The spelling of 124945 in words is "one hundred twenty-four thousand, nine hundred forty-five".