56121017 has 2 divisors, whose sum is σ = 56121018. Its totient is φ = 56121016.

The previous prime is 56121007. The next prime is 56121053. The reversal of 56121017 is 71012165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30426256 + 25694761 = 5516^2 + 5069^2 .

It is a cyclic number.

It is not a de Polignac number, because 56121017 - 2⁴ = 56121001 is a prime.

It is a super-2 number, since 2×56121017² = 6299137098228578, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 56120983 and 56121001.

It is not a weakly prime, because it can be changed into another prime (56121007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28060508 + 28060509.

It is an arithmetic number, because the mean of its divisors is an integer number (28060509).

Almost surely, 2^56121017 is an apocalyptic number.

It is an amenable number.

56121017 is a deficient number, since it is larger than the sum of its proper divisors (1).

56121017 is an equidigital number, since it uses as much as digits as its factorization.

56121017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 56121017 is about 7491.3961983064. The cubic root of 56121017 is about 382.8616301692.

The spelling of 56121017 in words is "fifty-six million, one hundred twenty-one thousand, seventeen".