53561209 has 24 divisors (see below), whose sum is σ = 62023752. Its totient is φ = 45964800.

The previous prime is 53561201. The next prime is 53561243. The reversal of 53561209 is 90216535.

It can be written as a sum of positive squares in 4 ways, for example, as 1432809 + 52128400 = 1197^2 + 7220^2 .

It is not a de Polignac number, because 53561209 - 2³ = 53561201 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (53561201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 473937 + ... + 474049.

It is an arithmetic number, because the mean of its divisors is an integer number (2584323).

Almost surely, 2^53561209 is an apocalyptic number.

It is an amenable number.

53561209 is a deficient number, since it is larger than the sum of its proper divisors (8462543).

53561209 is a wasteful number, since it uses less digits than its factorization.

53561209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 53561209 is about 7318.5523841809. The cubic root of 53561209 is about 376.9497478676.

The spelling of 53561209 in words is "fifty-three million, five hundred sixty-one thousand, two hundred nine".