2193257081 has 2 divisors, whose sum is σ = 2193257082. Its totient is φ = 2193257080.

The previous prime is 2193257063. The next prime is 2193257089. The reversal of 2193257081 is 1807523912.

2193257081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2132961856 + 60295225 = 46184^2 + 7765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2193257081 is a prime.

It is a super-2 number, since 2×2193257081² = 9620753246713281122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2193257089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1096628540 + 1096628541.

It is an arithmetic number, because the mean of its divisors is an integer number (1096628541).

Almost surely, 2^2193257081 is an apocalyptic number.

It is an amenable number.

2193257081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2193257081 is an equidigital number, since it uses as much as digits as its factorization.

2193257081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 2193257081 is about 46832.2226784081. Note that the first 3 decimals coincide. The cubic root of 2193257081 is about 1299.2613320404.

The spelling of 2193257081 in words is "two billion, one hundred ninety-three million, two hundred fifty-seven thousand, eighty-one".