60821209 has 4 divisors (see below), whose sum is σ = 61818340. Its totient is φ = 59824080.

The previous prime is 60821203. The next prime is 60821213. The reversal of 60821209 is 90212806.

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 21483225 + 39337984 = 4635^2 + 6272^2 .

It is a cyclic number.

It is not a de Polignac number, because 60821209 - 2¹³ = 60813017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (60821203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498474 + ... + 498595.

It is an arithmetic number, because the mean of its divisors is an integer number (15454585).

Almost surely, 2^60821209 is an apocalyptic number.

It is an amenable number.

60821209 is a deficient number, since it is larger than the sum of its proper divisors (997131).

60821209 is an equidigital number, since it uses as much as digits as its factorization.

60821209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997130.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 60821209 is about 7798.7953556944. The cubic root of 60821209 is about 393.2647461723.

The spelling of 60821209 in words is "sixty million, eight hundred twenty-one thousand, two hundred nine".