2170051561 has 2 divisors, whose sum is σ = 2170051562. Its totient is φ = 2170051560.

The previous prime is 2170051511. The next prime is 2170051577. The reversal of 2170051561 is 1651500712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1619257600 + 550793961 = 40240^2 + 23469^2 .

It is a cyclic number.

It is not a de Polignac number, because 2170051561 - 2²⁹ = 1633180649 is a prime.

It is a super-3 number, since 3×2170051561³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2170051501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085025780 + 1085025781.

It is an arithmetic number, because the mean of its divisors is an integer number (1085025781).

Almost surely, 2^2170051561 is an apocalyptic number.

It is an amenable number.

2170051561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170051561 is an equidigital number, since it uses as much as digits as its factorization.

2170051561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 2170051561 is about 46583.8122205558. The cubic root of 2170051561 is about 1294.6628443056.

The spelling of 2170051561 in words is "two billion, one hundred seventy million, fifty-one thousand, five hundred sixty-one".