1961375777 has 2 divisors, whose sum is σ = 1961375778. Its totient is φ = 1961375776.

The previous prime is 1961375737. The next prime is 1961375803. The reversal of 1961375777 is 7775731691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1065630736 + 895745041 = 32644^2 + 29929^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961375777 - 2³⁰ = 887633953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961375737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980687888 + 980687889.

It is an arithmetic number, because the mean of its divisors is an integer number (980687889).

Almost surely, 2^1961375777 is an apocalyptic number.

It is an amenable number.

1961375777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961375777 is an equidigital number, since it uses as much as digits as its factorization.

1961375777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944810, while the sum is 53.

The square root of 1961375777 is about 44287.4223341120. The cubic root of 1961375777 is about 1251.7576930137.

The spelling of 1961375777 in words is "one billion, nine hundred sixty-one million, three hundred seventy-five thousand, seven hundred seventy-seven".