2161056697 has 2 divisors, whose sum is σ = 2161056698. Its totient is φ = 2161056696.

The previous prime is 2161056679. The next prime is 2161056721. The reversal of 2161056697 is 7966501612.

2161056697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (2161056679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204020601 + 957036096 = 34699^2 + 30936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161056697 - 2¹⁵ = 2161023929 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161056497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080528348 + 1080528349.

It is an arithmetic number, because the mean of its divisors is an integer number (1080528349).

Almost surely, 2^2161056697 is an apocalyptic number.

It is an amenable number.

2161056697 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161056697 is an equidigital number, since it uses as much as digits as its factorization.

2161056697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 2161056697 is about 46487.1670141341. The cubic root of 2161056697 is about 1292.8715745312.

The spelling of 2161056697 in words is "two billion, one hundred sixty-one million, fifty-six thousand, six hundred ninety-seven".