820451225 has 12 divisors (see below), whose sum is σ = 1109847120. Its totient is φ = 596691600.

The previous prime is 820451201. The next prime is 820451231. The reversal of 820451225 is 522154028.

It is not a de Polignac number, because 820451225 - 2¹⁰ = 820450201 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1491455 + ... + 1492004.

It is an arithmetic number, because the mean of its divisors is an integer number (92487260).

Almost surely, 2^820451225 is an apocalyptic number.

It is an amenable number.

820451225 is a deficient number, since it is larger than the sum of its proper divisors (289395895).

820451225 is a wasteful number, since it uses less digits than its factorization.

820451225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983480 (or 2983475 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 820451225 is about 28643.5197732402. The cubic root of 820451225 is about 936.1618146380.

The spelling of 820451225 in words is "eight hundred twenty million, four hundred fifty-one thousand, two hundred twenty-five".