3449778961 has 2 divisors, whose sum is σ = 3449778962. Its totient is φ = 3449778960.

The previous prime is 3449778887. The next prime is 3449778977. The reversal of 3449778961 is 1698779443.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3439118736 + 10660225 = 58644^2 + 3265^2 .

It is a cyclic number.

It is not a de Polignac number, because 3449778961 - 2²³ = 3441390353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3449778896 and 3449778905.

It is not a weakly prime, because it can be changed into another prime (3449778161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1724889480 + 1724889481.

It is an arithmetic number, because the mean of its divisors is an integer number (1724889481).

Almost surely, 2^3449778961 is an apocalyptic number.

It is an amenable number.

3449778961 is a deficient number, since it is larger than the sum of its proper divisors (1).

3449778961 is an equidigital number, since it uses as much as digits as its factorization.

3449778961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 58.

The square root of 3449778961 is about 58734.8189832913. The cubic root of 3449778961 is about 1510.9975369932.

The spelling of 3449778961 in words is "three billion, four hundred forty-nine million, seven hundred seventy-eight thousand, nine hundred sixty-one".