2161849757 has 2 divisors, whose sum is σ = 2161849758. Its totient is φ = 2161849756.

The previous prime is 2161849733. The next prime is 2161849777. The reversal of 2161849757 is 7579481612.

It is a happy number.

2161849757 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., 1624815481 + 537034276 = 40309^2 + 23174^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161849757 - 2¹² = 2161845661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161849717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080924878 + 1080924879.

It is an arithmetic number, because the mean of its divisors is an integer number (1080924879).

Almost surely, 2^2161849757 is an apocalyptic number.

It is an amenable number.

2161849757 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161849757 is an equidigital number, since it uses as much as digits as its factorization.

2161849757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 50.

The square root of 2161849757 is about 46495.6961126511. The cubic root of 2161849757 is about 1293.0297069446.

The spelling of 2161849757 in words is "two billion, one hundred sixty-one million, eight hundred forty-nine thousand, seven hundred fifty-seven".