1956961387 has 2 divisors, whose sum is σ = 1956961388. Its totient is φ = 1956961386.

The previous prime is 1956961343. The next prime is 1956961421. The reversal of 1956961387 is 7831696591.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1956961387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1956961327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978480693 + 978480694.

It is an arithmetic number, because the mean of its divisors is an integer number (978480694).

Almost surely, 2^1956961387 is an apocalyptic number.

1956961387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956961387 is an equidigital number, since it uses as much as digits as its factorization.

1956961387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 55.

The square root of 1956961387 is about 44237.5562955279. The cubic root of 1956961387 is about 1250.8178939495.

The spelling of 1956961387 in words is "one billion, nine hundred fifty-six million, nine hundred sixty-one thousand, three hundred eighty-seven".