250472821 has 4 divisors (see below), whose sum is σ = 251117100. Its totient is φ = 249828544.

The previous prime is 250472791. The next prime is 250472843. The reversal of 250472821 is 128274052.

It is a happy number.

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 123099025 + 127373796 = 11095^2 + 11286^2 .

It is a cyclic number.

It is not a de Polignac number, because 250472821 - 2⁷ = 250472693 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 (250472851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321556 + ... + 322333.

It is an arithmetic number, because the mean of its divisors is an integer number (62779275).

Almost surely, 2^250472821 is an apocalyptic number.

It is an amenable number.

250472821 is a deficient number, since it is larger than the sum of its proper divisors (644279).

250472821 is an equidigital number, since it uses as much as digits as its factorization.

250472821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644278.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 250472821 is about 15826.3331507965. Note that the first 3 decimals coincide. The cubic root of 250472821 is about 630.3574195928.

The spelling of 250472821 in words is "two hundred fifty million, four hundred seventy-two thousand, eight hundred twenty-one".