3454778861 has 2 divisors, whose sum is σ = 3454778862. Its totient is φ = 3454778860.

The previous prime is 3454778843. The next prime is 3454778863. The reversal of 3454778861 is 1688774543.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2302176361 + 1152602500 = 47981^2 + 33950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3454778861 is a prime.

It is a Sophie Germain prime.

Together with 3454778863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3454778863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1727389430 + 1727389431.

It is an arithmetic number, because the mean of its divisors is an integer number (1727389431).

Almost surely, 2^3454778861 is an apocalyptic number.

It is an amenable number.

3454778861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3454778861 is an equidigital number, since it uses as much as digits as its factorization.

3454778861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4515840, while the sum is 53.

The square root of 3454778861 is about 58777.3669110824. The cubic root of 3454778861 is about 1511.7271672841.

The spelling of 3454778861 in words is "three billion, four hundred fifty-four million, seven hundred seventy-eight thousand, eight hundred sixty-one".