1961914649 has 2 divisors, whose sum is σ = 1961914650. Its totient is φ = 1961914648.

The previous prime is 1961914609. The next prime is 1961914663. The reversal of 1961914649 is 9464191691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1961161225 + 753424 = 44285^2 + 868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961914649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1961914597 and 1961914606.

It is not a weakly prime, because it can be changed into another prime (1961914609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980957324 + 980957325.

It is an arithmetic number, because the mean of its divisors is an integer number (980957325).

Almost surely, 2^1961914649 is an apocalyptic number.

It is an amenable number.

1961914649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961914649 is an equidigital number, since it uses as much as digits as its factorization.

1961914649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 50.

The square root of 1961914649 is about 44293.5057203649. The cubic root of 1961914649 is about 1251.8723192563.

The spelling of 1961914649 in words is "one billion, nine hundred sixty-one million, nine hundred fourteen thousand, six hundred forty-nine".