961681387 has 2 divisors, whose sum is σ = 961681388. Its totient is φ = 961681386.

The previous prime is 961681327. The next prime is 961681421. The reversal of 961681387 is 783186169.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 961681387 - 2¹¹ = 961679339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 961681387.

It is not a weakly prime, because it can be changed into another prime (961681327) 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, 480840693 + 480840694.

It is an arithmetic number, because the mean of its divisors is an integer number (480840694).

Almost surely, 2^961681387 is an apocalyptic number.

961681387 is a deficient number, since it is larger than the sum of its proper divisors (1).

961681387 is an equidigital number, since it uses as much as digits as its factorization.

961681387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 961681387 is about 31010.9881654874. The cubic root of 961681387 is about 987.0604183980.

The spelling of 961681387 in words is "nine hundred sixty-one million, six hundred eighty-one thousand, three hundred eighty-seven".