120556817 has 2 divisors, whose sum is σ = 120556818. Its totient is φ = 120556816.

The previous prime is 120556781. The next prime is 120556831. The reversal of 120556817 is 718655021.

Together with previous prime (120556781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75411856 + 45144961 = 8684^2 + 6719^2 .

It is a cyclic number.

It is not a de Polignac number, because 120556817 - 2¹⁰ = 120555793 is a prime.

It is a super-2 number, since 2×120556817² = 29067892250342978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120556847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60278408 + 60278409.

It is an arithmetic number, because the mean of its divisors is an integer number (60278409).

Almost surely, 2^120556817 is an apocalyptic number.

It is an amenable number.

120556817 is a deficient number, since it is larger than the sum of its proper divisors (1).

120556817 is an equidigital number, since it uses as much as digits as its factorization.

120556817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 120556817 is about 10979.8368384963. The cubic root of 120556817 is about 494.0041427966.

The spelling of 120556817 in words is "one hundred twenty million, five hundred fifty-six thousand, eight hundred seventeen".