61020217 has 4 divisors (see below), whose sum is σ = 61049380. Its totient is φ = 60991056.

The previous prime is 61020209. The next prime is 61020221. The reversal of 61020217 is 71202016.

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 30151081 + 30869136 = 5491^2 + 5556^2 .

It is a cyclic number.

It is not a de Polignac number, because 61020217 - 2³ = 61020209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61020194 and 61020203.

It is not an unprimeable number, because it can be changed into a prime (61020247) 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, 11178 + ... + 15715.

It is an arithmetic number, because the mean of its divisors is an integer number (15262345).

Almost surely, 2^61020217 is an apocalyptic number.

It is an amenable number.

61020217 is a deficient number, since it is larger than the sum of its proper divisors (29163).

61020217 is a wasteful number, since it uses less digits than its factorization.

61020217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29162.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 61020217 is about 7811.5438294872. The cubic root of 61020217 is about 393.6932021206.

The spelling of 61020217 in words is "sixty-one million, twenty thousand, two hundred seventeen".