56121217 has 4 divisors (see below), whose sum is σ = 56181060. Its totient is φ = 56061376.

The previous prime is 56121211. The next prime is 56121229. The reversal of 56121217 is 71212165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71212165 = 5 ⋅14242433.

It can be written as a sum of positive squares in 2 ways, for example, as 17631601 + 38489616 = 4199^2 + 6204^2 .

It is a cyclic number.

It is not a de Polignac number, because 56121217 - 2³ = 56121209 is a prime.

It is a super-2 number, since 2×56121217² = 6299181995122178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56121191 and 56121200.

It is not an unprimeable number, because it can be changed into a prime (56121211) 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, 28492 + ... + 30397.

It is an arithmetic number, because the mean of its divisors is an integer number (14045265).

Almost surely, 2^56121217 is an apocalyptic number.

It is an amenable number.

56121217 is a deficient number, since it is larger than the sum of its proper divisors (59843).

56121217 is an equidigital number, since it uses as much as digits as its factorization.

56121217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59842.

The product of its digits is 840, while the sum is 25.

The square root of 56121217 is about 7491.4095469411. The cubic root of 56121217 is about 382.8620849734.

The spelling of 56121217 in words is "fifty-six million, one hundred twenty-one thousand, two hundred seventeen".