125000821 has 8 divisors (see below), whose sum is σ = 136533600. Its totient is φ = 113496240.

The previous prime is 125000819. The next prime is 125000833. The reversal of 125000821 is 128000521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125000821 - 2¹ = 125000819 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 (125000801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2835 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (17066700).

Almost surely, 2^125000821 is an apocalyptic number.

125000821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125000821 is a deficient number, since it is larger than the sum of its proper divisors (11532779).

125000821 is a wasteful number, since it uses less digits than its factorization.

125000821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14099.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 125000821 is about 11180.3766036749. The cubic root of 125000821 is about 500.0010946643.

The spelling of 125000821 in words is "one hundred twenty-five million, eight hundred twenty-one", and thus it is an aban number.