124945821 has 160 divisors (see below), whose sum is σ = 265402368. Its totient is φ = 56453760.

The previous prime is 124945817. The next prime is 124945823. The reversal of 124945821 is 128549421.

It is not a de Polignac number, because 124945821 - 2² = 124945817 is a prime.

It is a super-2 number, since 2×124945821² = 31222916370728082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124945823) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1864830 + ... + 1864896.

Almost surely, 2^124945821 is an apocalyptic number.

124945821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

124945821 is an abundant number, since it is smaller than the sum of its proper divisors (140456547).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

124945821 is a wasteful number, since it uses less digits than its factorization.

124945821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 124 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 124945821 is about 11177.9166663560. The cubic root of 124945821 is about 499.9277508940.

The spelling of 124945821 in words is "one hundred twenty-four million, nine hundred forty-five thousand, eight hundred twenty-one".