210825009 has 12 divisors (see below), whose sum is σ = 308380800. Its totient is φ = 138770424.

The previous prime is 210824987. The next prime is 210825011. The reversal of 210825009 is 900528012.

210825009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210825009 - 2¹⁶ = 210759473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (210825019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147549 + ... + 148970.

It is an arithmetic number, because the mean of its divisors is an integer number (25698400).

Almost surely, 2^210825009 is an apocalyptic number.

It is an amenable number.

210825009 is a deficient number, since it is larger than the sum of its proper divisors (97555791).

210825009 is a wasteful number, since it uses less digits than its factorization.

210825009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296604 (or 296601 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 210825009 is about 14519.8143583174. The cubic root of 210825009 is about 595.1695574012.

The spelling of 210825009 in words is "two hundred ten million, eight hundred twenty-five thousand, nine".